diff --git a/dom/animation/EffectCompositor.cpp b/dom/animation/EffectCompositor.cpp
index 802cbbb1e3..21f19d5974 100644
--- a/dom/animation/EffectCompositor.cpp
+++ b/dom/animation/EffectCompositor.cpp
@@ -14,8 +14,7 @@
 #include "mozilla/AnimationUtils.h"
 #include "mozilla/EffectSet.h"
 #include "mozilla/LayerAnimationInfo.h"
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 #include "nsComputedDOMStyle.h" // nsComputedDOMStyle::GetPresShellForContent
 #include "nsCSSPropertyIDSet.h"
 #include "nsCSSProps.h"
@@ -202,7 +201,7 @@ EffectCompositor::RequestRestyle(dom::Element* aElement,
 
   if (aRestyleType == RestyleType::Layer) {
     // Prompt layers to re-sync their animations.
-    mPresContext->RestyleManager()->AsGecko()->IncrementAnimationGeneration();
+    mPresContext->RestyleManager()->IncrementAnimationGeneration();
     EffectSet* effectSet =
       EffectSet::GetEffectSet(aElement, aPseudoType);
     if (effectSet) {
@@ -314,7 +313,7 @@ EffectCompositor::GetAnimationRule(dom::Element* aElement,
     return nullptr;
   }
 
-  if (mPresContext->RestyleManager()->AsGecko()->SkipAnimationRules()) {
+  if (mPresContext->RestyleManager()->SkipAnimationRules()) {
     // We don't need to worry about updating mElementsToRestyle in this case
     // since this is not the animation restyle we requested when we called
     // PostRestyleForAnimation (see comment at start of this method).
diff --git a/dom/animation/EffectSet.cpp b/dom/animation/EffectSet.cpp
index 3731e47bae..b528bae16d 100644
--- a/dom/animation/EffectSet.cpp
+++ b/dom/animation/EffectSet.cpp
@@ -5,8 +5,7 @@
 
 #include "EffectSet.h"
 #include "mozilla/dom/Element.h" // For Element
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 #include "nsCSSPseudoElements.h" // For CSSPseudoElementType
 #include "nsCycleCollectionNoteChild.h" // For CycleCollectionNoteChild
 #include "nsPresContext.h"
@@ -111,7 +110,7 @@ void
 EffectSet::UpdateAnimationGeneration(nsPresContext* aPresContext)
 {
   mAnimationGeneration =
-    aPresContext->RestyleManager()->AsGecko()->GetAnimationGeneration();
+    aPresContext->RestyleManager()->GetAnimationGeneration();
 }
 
 /* static */ nsIAtom**
diff --git a/dom/svg/nsSVGElement.cpp b/dom/svg/nsSVGElement.cpp
index a71b0d6486..9698617042 100644
--- a/dom/svg/nsSVGElement.cpp
+++ b/dom/svg/nsSVGElement.cpp
@@ -54,8 +54,7 @@
 #include "nsSMILAnimationController.h"
 #include "mozilla/dom/SVGElementBinding.h"
 #include "mozilla/Unused.h"
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 
 using namespace mozilla;
 using namespace mozilla::dom;
@@ -927,9 +926,9 @@ nsSVGElement::WalkAnimatedContentStyleRules(nsRuleWalker* aRuleWalker)
   // whether this is a "no-animation restyle". (This should match the check
   // in nsHTMLCSSStyleSheet::RulesMatching(), where we determine whether to
   // apply the SMILOverrideStyle.)
-  RestyleManagerHandle restyleManager =
+  RestyleManager* restyleManager =
     aRuleWalker->PresContext()->RestyleManager();
-  if (!restyleManager->AsGecko()->SkipAnimationRules()) {
+  if (!restyleManager->SkipAnimationRules()) {
     // update/walk the animated content style rule.
     css::StyleRule* animContentStyleRule = GetAnimatedContentStyleRule();
     if (!animContentStyleRule) {
diff --git a/layout/base/RestyleManagerHandle.h b/layout/base/RestyleManagerHandle.h
deleted file mode 100644
index 9cebd030a4..0000000000
--- a/layout/base/RestyleManagerHandle.h
+++ /dev/null
@@ -1,155 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef mozilla_RestyleManagerHandle_h
-#define mozilla_RestyleManagerHandle_h
-
-#include "mozilla/Assertions.h"
-#include "mozilla/EventStates.h"
-#include "mozilla/HandleRefPtr.h"
-#include "mozilla/RefCountType.h"
-#include "nsChangeHint.h"
-
-namespace mozilla {
-class RestyleManager;
-namespace dom {
-class Element;
-} // namespace dom
-} // namespace mozilla
-class nsAttrValue;
-class nsIAtom;
-class nsIContent;
-class nsIFrame;
-class nsStyleChangeList;
-
-namespace mozilla {
-
-/**
- * Smart pointer class that can hold a pointer to a RestyleManager.
- */
-class RestyleManagerHandle
-{
-public:
-  typedef HandleRefPtr<RestyleManagerHandle> RefPtr;
-
-  // We define this Ptr class with a RestyleManager API that forwards on to the
-  // wrapped pointer, rather than putting these methods on RestyleManagerHandle
-  // itself, so that we can have RestyleManagerHandle behave like a smart
-  // pointer and be dereferenced with operator->.
-  class Ptr
-  {
-  public:
-    friend class ::mozilla::RestyleManagerHandle;
-
-    RestyleManager* AsGecko()
-    {
-      return reinterpret_cast<RestyleManager*>(mValue);
-    }
-
-    RestyleManager* GetAsGecko() { return AsGecko(); }
-
-    const RestyleManager* AsGecko() const
-    {
-      return const_cast<Ptr*>(this)->AsGecko();
-    }
-
-    const RestyleManager* GetAsGecko() const { return AsGecko(); }
-
-    // These inline methods are defined in RestyleManagerHandleInlines.h.
-    inline MozExternalRefCountType AddRef();
-    inline MozExternalRefCountType Release();
-
-    // Restyle manager interface.  These inline methods are defined in
-    // RestyleManagerHandleInlines.h and just forward to the underlying
-    // RestyleManager.  See corresponding comments in
-    // RestyleManager.h for descriptions of these methods.
-
-    inline void Disconnect();
-    inline void PostRestyleEvent(dom::Element* aElement,
-                                 nsRestyleHint aRestyleHint,
-                                 nsChangeHint aMinChangeHint);
-    inline void PostRestyleEventForLazyConstruction();
-    inline void RebuildAllStyleData(nsChangeHint aExtraHint,
-                                    nsRestyleHint aRestyleHint);
-    inline void PostRebuildAllStyleDataEvent(nsChangeHint aExtraHint,
-                                             nsRestyleHint aRestyleHint);
-    inline void ProcessPendingRestyles();
-    inline void ContentInserted(nsINode* aContainer,
-                                nsIContent* aChild);
-    inline void ContentAppended(nsIContent* aContainer,
-                                nsIContent* aFirstNewContent);
-    inline void ContentRemoved(nsINode* aContainer,
-                               nsIContent* aOldChild,
-                               nsIContent* aFollowingSibling);
-    inline void RestyleForInsertOrChange(nsINode* aContainer,
-                                         nsIContent* aChild);
-    inline void RestyleForAppend(nsIContent* aContainer,
-                                 nsIContent* aFirstNewContent);
-  inline void ContentStateChanged(nsIContent* aContent,
-                                  EventStates aStateMask);
-    inline void AttributeWillChange(dom::Element* aElement,
-                                    int32_t aNameSpaceID,
-                                    nsIAtom* aAttribute,
-                                    int32_t aModType,
-                                    const nsAttrValue* aNewValue);
-    inline void AttributeChanged(dom::Element* aElement,
-                                 int32_t aNameSpaceID,
-                                 nsIAtom* aAttribute,
-                                 int32_t aModType,
-                                 const nsAttrValue* aOldValue);
-    inline nsresult ReparentStyleContext(nsIFrame* aFrame);
-    inline bool HasPendingRestyles();
-    inline uint64_t GetRestyleGeneration() const;
-    inline uint32_t GetHoverGeneration() const;
-    inline void SetObservingRefreshDriver(bool aObserving);
-    inline nsresult ProcessRestyledFrames(nsStyleChangeList& aChangeList);
-    inline void FlushOverflowChangedTracker();
-    inline void NotifyDestroyingFrame(nsIFrame* aFrame);
-
-  private:
-    // Stores a pointer to an RestyleManager.
-    uintptr_t mValue;
-  };
-
-  MOZ_IMPLICIT RestyleManagerHandle(decltype(nullptr) = nullptr)
-  {
-    mPtr.mValue = 0;
-  }
-  RestyleManagerHandle(const RestyleManagerHandle& aOth)
-  {
-    mPtr.mValue = aOth.mPtr.mValue;
-  }
-  MOZ_IMPLICIT RestyleManagerHandle(RestyleManager* aManager)
-  {
-    *this = aManager;
-  }
-
-  RestyleManagerHandle& operator=(decltype(nullptr))
-  {
-    mPtr.mValue = 0;
-    return *this;
-  }
-
-  RestyleManagerHandle& operator=(RestyleManager* aManager)
-  {
-    mPtr.mValue = reinterpret_cast<uintptr_t>(aManager);
-    return *this;
-  }
-
-  // Make RestyleManagerHandle usable in boolean contexts.
-  explicit operator bool() const { return !!mPtr.mValue; }
-  bool operator!() const { return !mPtr.mValue; }
-
-  // Make RestyleManagerHandle behave like a smart pointer.
-  Ptr* operator->() { return &mPtr; }
-  const Ptr* operator->() const { return &mPtr; }
-
-private:
-  Ptr mPtr;
-};
-
-} // namespace mozilla
-
-#endif // mozilla_RestyleManagerHandle_h
diff --git a/layout/base/RestyleManagerHandleInlines.h b/layout/base/RestyleManagerHandleInlines.h
deleted file mode 100644
index 74ee6a2e10..0000000000
--- a/layout/base/RestyleManagerHandleInlines.h
+++ /dev/null
@@ -1,181 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef mozilla_RestyleManagerHandleInlines_h
-#define mozilla_RestyleManagerHandleInlines_h
-
-#include "mozilla/RestyleManager.h"
-
-namespace mozilla {
-
-MozExternalRefCountType
-RestyleManagerHandle::Ptr::AddRef()
-{
-  return AsGecko()->AddRef();
-}
-
-MozExternalRefCountType
-RestyleManagerHandle::Ptr::Release()
-{
-  return AsGecko()->Release();
-}
-
-void
-RestyleManagerHandle::Ptr::Disconnect()
-{
-  AsGecko()->Disconnect();
-}
-
-void
-RestyleManagerHandle::Ptr::PostRestyleEvent(dom::Element* aElement,
-                                            nsRestyleHint aRestyleHint,
-                                            nsChangeHint aMinChangeHint)
-{
-  AsGecko()->PostRestyleEvent(aElement, aRestyleHint, aMinChangeHint);
-}
-
-void
-RestyleManagerHandle::Ptr::PostRestyleEventForLazyConstruction()
-{
-  AsGecko()->PostRestyleEventForLazyConstruction();
-}
-
-void
-RestyleManagerHandle::Ptr::RebuildAllStyleData(nsChangeHint aExtraHint,
-                                               nsRestyleHint aRestyleHint)
-{
-  AsGecko()->RebuildAllStyleData(aExtraHint, aRestyleHint);
-}
-
-void
-RestyleManagerHandle::Ptr::PostRebuildAllStyleDataEvent(
-    nsChangeHint aExtraHint,
-    nsRestyleHint aRestyleHint)
-{
-  AsGecko()->PostRebuildAllStyleDataEvent(aExtraHint, aRestyleHint);
-}
-
-void
-RestyleManagerHandle::Ptr::ProcessPendingRestyles()
-{
-  AsGecko()->ProcessPendingRestyles();
-}
-
-nsresult
-RestyleManagerHandle::Ptr::ProcessRestyledFrames(nsStyleChangeList& aChangeList)
-{
-  return AsGecko()->ProcessRestyledFrames(aChangeList);
-}
-
-void
-RestyleManagerHandle::Ptr::FlushOverflowChangedTracker()
-{
-  AsGecko()->FlushOverflowChangedTracker();
-}
-
-void
-RestyleManagerHandle::Ptr::ContentInserted(nsINode* aContainer,
-                                           nsIContent* aChild)
-{
-  AsGecko()->ContentInserted(aContainer, aChild);
-}
-
-void
-RestyleManagerHandle::Ptr::ContentAppended(nsIContent* aContainer,
-                                           nsIContent* aFirstNewContent)
-{
-  AsGecko()->ContentAppended(aContainer, aFirstNewContent);
-}
-
-void
-RestyleManagerHandle::Ptr::ContentRemoved(nsINode* aContainer,
-                                          nsIContent* aOldChild,
-                                          nsIContent* aFollowingSibling)
-{
-  AsGecko()->ContentRemoved(aContainer, aOldChild, aFollowingSibling);
-}
-
-void
-RestyleManagerHandle::Ptr::RestyleForInsertOrChange(nsINode* aContainer,
-                                                    nsIContent* aChild)
-{
-  AsGecko()->RestyleForInsertOrChange(aContainer, aChild);
-}
-
-void
-RestyleManagerHandle::Ptr::RestyleForAppend(nsIContent* aContainer,
-                                            nsIContent* aFirstNewContent)
-{
-  AsGecko()->RestyleForAppend(aContainer, aFirstNewContent);
-}
-
-void
-RestyleManagerHandle::Ptr::ContentStateChanged(nsIContent* aContent,
-                                          EventStates aStateMask)
-{
-  AsGecko()->ContentStateChanged(aContent, aStateMask);
-}
-
-void
-RestyleManagerHandle::Ptr::AttributeWillChange(dom::Element* aElement,
-                                               int32_t aNameSpaceID,
-                                               nsIAtom* aAttribute,
-                                               int32_t aModType,
-                                               const nsAttrValue* aNewValue)
-{
-  AsGecko()->AttributeWillChange(aElement, aNameSpaceID, aAttribute, aModType,
-                                 aNewValue);
-}
-
-void
-RestyleManagerHandle::Ptr::AttributeChanged(dom::Element* aElement,
-                                            int32_t aNameSpaceID,
-                                            nsIAtom* aAttribute,
-                                            int32_t aModType,
-                                            const nsAttrValue* aOldValue)
-{
-  AsGecko()->AttributeChanged(aElement, aNameSpaceID, aAttribute, aModType,
-                              aOldValue);
-}
-
-nsresult
-RestyleManagerHandle::Ptr::ReparentStyleContext(nsIFrame* aFrame)
-{
-  return AsGecko()->ReparentStyleContext(aFrame);
-}
-
-bool
-RestyleManagerHandle::Ptr::HasPendingRestyles()
-{
-  return AsGecko()->HasPendingRestyles();
-}
-
-uint64_t
-RestyleManagerHandle::Ptr::GetRestyleGeneration() const
-{
-  return AsGecko()->GetRestyleGeneration();
-}
-
-uint32_t
-RestyleManagerHandle::Ptr::GetHoverGeneration() const
-{
-  return AsGecko()->GetHoverGeneration();
-}
-
-void
-RestyleManagerHandle::Ptr::SetObservingRefreshDriver(bool aObserving)
-{
-  AsGecko()->SetObservingRefreshDriver(aObserving);
-}
-
-void
-RestyleManagerHandle::Ptr::NotifyDestroyingFrame(nsIFrame* aFrame)
-{
-  AsGecko()->NotifyDestroyingFrame(aFrame);
-}
-
-} // namespace mozilla
-
-#endif // mozilla_RestyleManagerHandleInlines_h
diff --git a/layout/base/moz.build b/layout/base/moz.build
index 1b3532aa28..4838e9bbb5 100644
--- a/layout/base/moz.build
+++ b/layout/base/moz.build
@@ -112,8 +112,6 @@ EXPORTS.mozilla += [
     'RestyleLogging.h',
     'RestyleManager.h',
     'RestyleManagerBase.h',
-    'RestyleManagerHandle.h',
-    'RestyleManagerHandleInlines.h',
     'StaticPresData.h',
 ]
 
diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp
index e6a7c76dd8..fdeb9f35b9 100644
--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -79,8 +79,7 @@
 #include "nsAutoLayoutPhase.h"
 #include "nsStyleStructInlines.h"
 #include "nsPageContentFrame.h"
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 #include "StickyScrollContainer.h"
 #include "nsFieldSetFrame.h"
 #include "nsInlineFrame.h"
@@ -454,7 +453,7 @@ AnyKidsNeedBlockParent(nsIFrame *aFrameList)
 
 // Reparent a frame into a wrapper frame that is a child of its old parent.
 static void
-ReparentFrame(RestyleManagerHandle aRestyleManager,
+ReparentFrame(RestyleManager* aRestyleManager,
               nsContainerFrame* aNewParentFrame,
               nsIFrame* aFrame)
 {
@@ -467,7 +466,7 @@ ReparentFrames(nsCSSFrameConstructor* aFrameConstructor,
                nsContainerFrame* aNewParentFrame,
                const nsFrameList& aFrameList)
 {
-  RestyleManagerHandle restyleManager = aFrameConstructor->RestyleManager();
+  RestyleManager* restyleManager = aFrameConstructor->RestyleManager();
   for (nsFrameList::Enumerator e(aFrameList); !e.AtEnd(); e.Next()) {
     ReparentFrame(restyleManager, aNewParentFrame, e.get());
   }
@@ -1883,9 +1882,9 @@ nsCSSFrameConstructor::CreateGeneratedContentItem(nsFrameConstructorState& aStat
     return;
   }
 
-  if (mozilla::RestyleManager* geckoRM = RestyleManager()->GetAsGecko()) {
+  if (mozilla::RestyleManager* restyleManager = RestyleManager()) {
     RestyleManager::ReframingStyleContexts* rsc =
-      geckoRM->GetReframingStyleContexts();
+      restyleManager->GetReframingStyleContexts();
     if (rsc) {
       nsStyleContext* oldStyleContext = rsc->Get(container, aPseudoElement);
       if (oldStyleContext) {
@@ -5056,9 +5055,9 @@ nsCSSFrameConstructor::ResolveStyleContext(nsStyleContext* aParentStyleContext,
     result = styleSet->ResolveStyleForText(aContent, aParentStyleContext);
   }
 
-  if (mozilla::RestyleManager* geckoRM = RestyleManager()->GetAsGecko()) {
+  if (mozilla::RestyleManager* restyleManager = RestyleManager()) {
     RestyleManager::ReframingStyleContexts* rsc =
-      geckoRM->GetReframingStyleContexts();
+      restyleManager->GetReframingStyleContexts();
     if (rsc) {
       nsStyleContext* oldStyleContext =
         rsc->Get(aContent, CSSPseudoElementType::NotPseudo);
diff --git a/layout/base/nsCSSFrameConstructor.h b/layout/base/nsCSSFrameConstructor.h
index 6328e52944..4982d53573 100644
--- a/layout/base/nsCSSFrameConstructor.h
+++ b/layout/base/nsCSSFrameConstructor.h
@@ -14,7 +14,6 @@
 #include "mozilla/Attributes.h"
 #include "mozilla/LinkedList.h"
 #include "mozilla/RestyleManagerBase.h"
-#include "mozilla/RestyleManagerHandle.h"
 
 #include "nsCOMPtr.h"
 #include "nsILayoutHistoryState.h"
@@ -41,6 +40,8 @@ class nsFrameConstructorState;
 
 namespace mozilla {
 
+class RestyleManager;
+
 namespace dom {
 
 class FlattenedChildIterator;
@@ -72,7 +73,7 @@ private:
   nsCSSFrameConstructor& operator=(const nsCSSFrameConstructor& aCopy) = delete;
 
 public:
-  mozilla::RestyleManagerHandle RestyleManager() const
+  mozilla::RestyleManager* RestyleManager() const
     { return mPresShell->GetPresContext()->RestyleManager(); }
 
   nsIFrame* ConstructRootFrame();
diff --git a/layout/base/nsLayoutUtils.cpp b/layout/base/nsLayoutUtils.cpp
index d1baeb0d1c..e156e432d3 100644
--- a/layout/base/nsLayoutUtils.cpp
+++ b/layout/base/nsLayoutUtils.cpp
@@ -126,8 +126,7 @@
 #include "GeckoProfiler.h"
 #include "nsAnimationManager.h"
 #include "nsTransitionManager.h"
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 #include "LayoutLogging.h"
 
 // Make sure getpid() works.
diff --git a/layout/base/nsPresContext.cpp b/layout/base/nsPresContext.cpp
index f473619537..65f221a8ae 100644
--- a/layout/base/nsPresContext.cpp
+++ b/layout/base/nsPresContext.cpp
@@ -34,8 +34,6 @@
 #include "nsLayoutUtils.h"
 #include "nsViewManager.h"
 #include "mozilla/RestyleManager.h"
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
 #include "SurfaceCacheUtils.h"
 #include "nsCSSRuleProcessor.h"
 #include "nsRuleNode.h"
diff --git a/layout/base/nsPresContext.h b/layout/base/nsPresContext.h
index d904948c86..ee7427018b 100644
--- a/layout/base/nsPresContext.h
+++ b/layout/base/nsPresContext.h
@@ -39,7 +39,6 @@
 #include "nsIMessageManager.h"
 #include "mozilla/RestyleLogging.h"
 #include "Units.h"
-#include "mozilla/RestyleManagerHandle.h"
 #include "prenv.h"
 #include "mozilla/StaticPresData.h"
 
@@ -71,6 +70,7 @@ namespace mozilla {
 class EffectCompositor;
 class EventStateManager;
 class CounterStyleManager;
+class RestyleManager;
 namespace layers {
 class ContainerLayer;
 class LayerManager;
@@ -243,7 +243,7 @@ public:
 
   nsRefreshDriver* RefreshDriver() { return mRefreshDriver; }
 
-  mozilla::RestyleManagerHandle RestyleManager() {
+  mozilla::RestyleManager* RestyleManager() {
     MOZ_ASSERT(mRestyleManager);
     return mRestyleManager;
   }
@@ -1240,7 +1240,7 @@ protected:
   RefPtr<mozilla::EffectCompositor> mEffectCompositor;
   RefPtr<nsTransitionManager> mTransitionManager;
   RefPtr<nsAnimationManager> mAnimationManager;
-  mozilla::RestyleManagerHandle::RefPtr mRestyleManager;
+  RefPtr<mozilla::RestyleManager> mRestyleManager;
   RefPtr<mozilla::CounterStyleManager> mCounterStyleManager;
   nsIAtom* MOZ_UNSAFE_REF("always a static atom") mMedium; // initialized by subclass ctors
   nsCOMPtr<nsIAtom> mMediaEmulated;
diff --git a/layout/base/nsPresShell.cpp b/layout/base/nsPresShell.cpp
index 43a644a2b7..0a9627bc9b 100644
--- a/layout/base/nsPresShell.cpp
+++ b/layout/base/nsPresShell.cpp
@@ -178,8 +178,7 @@
 #include "nsPlaceholderFrame.h"
 #include "nsTransitionManager.h"
 #include "ChildIterator.h"
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 #include "nsIDOMHTMLElement.h"
 #include "nsIDragSession.h"
 #include "nsIFrameInlines.h"
@@ -567,7 +566,7 @@ VerifyStyleTree(nsPresContext* aPresContext, nsFrameManager* aFrameManager)
 {
   if (nsFrame::GetVerifyStyleTreeEnable()) {
     nsIFrame* rootFrame = aFrameManager->GetRootFrame();
-    aPresContext->RestyleManager()->AsGecko()->DebugVerifyStyleTree(rootFrame);
+    aPresContext->RestyleManager()->DebugVerifyStyleTree(rootFrame);
   }
 }
 #define VERIFY_STYLE_TREE ::VerifyStyleTree(mPresContext, mFrameConstructor)
@@ -2857,7 +2856,7 @@ PresShell::RecreateFramesFor(nsIContent* aContent)
 
   // Mark ourselves as not safe to flush while we're doing frame construction.
   ++mChangeNestCount;
-  RestyleManagerHandle restyleManager = mPresContext->RestyleManager();
+  RestyleManager* restyleManager = mPresContext->RestyleManager();
   nsresult rv = restyleManager->ProcessRestyledFrames(changeList);
   restyleManager->FlushOverflowChangedTracker();
   --mChangeNestCount;
@@ -3643,7 +3642,7 @@ void
 PresShell::DispatchSynthMouseMove(WidgetGUIEvent* aEvent,
                                   bool aFlushOnHoverChange)
 {
-  RestyleManagerHandle restyleManager = mPresContext->RestyleManager();
+  RestyleManager* restyleManager = mPresContext->RestyleManager();
   uint32_t hoverGenerationBefore =
     restyleManager->GetHoverGeneration();
   nsEventStatus status;
@@ -4448,7 +4447,7 @@ nsIPresShell::RestyleForCSSRuleChanges()
     return;
   }
 
-  RestyleManagerHandle restyleManager = mPresContext->RestyleManager();
+  RestyleManager* restyleManager = mPresContext->RestyleManager();
   if (scopeRoots.IsEmpty()) {
     // If scopeRoots is empty, we know that mStylesHaveChanged was true at
     // the beginning of this function, and that we need to restyle the whole
@@ -6731,7 +6730,7 @@ FlushThrottledStyles(nsIDocument *aDocument, void *aData)
   if (shell && shell->IsVisible()) {
     nsPresContext* presContext = shell->GetPresContext();
     if (presContext) {
-      presContext->RestyleManager()->AsGecko()->UpdateOnlyAnimationStyles();
+      presContext->RestyleManager()->UpdateOnlyAnimationStyles();
     }
   }
 
@@ -9477,9 +9476,9 @@ PresShell::Observe(nsISupports* aSubject,
         {
           nsAutoScriptBlocker scriptBlocker;
           ++mChangeNestCount;
-          RestyleManagerHandle restyleManager = mPresContext->RestyleManager();
-          restyleManager->AsGecko()->ProcessRestyledFrames(changeList);
-          restyleManager->AsGecko()->FlushOverflowChangedTracker();
+          RestyleManager* restyleManager = mPresContext->RestyleManager();
+          restyleManager->ProcessRestyledFrames(changeList);
+          restyleManager->FlushOverflowChangedTracker();
           --mChangeNestCount;
         }
       }
diff --git a/layout/base/nsRefreshDriver.cpp b/layout/base/nsRefreshDriver.cpp
index 02838d7640..7496aae282 100644
--- a/layout/base/nsRefreshDriver.cpp
+++ b/layout/base/nsRefreshDriver.cpp
@@ -46,8 +46,6 @@
 #include "mozilla/dom/Performance.h"
 #include "mozilla/dom/WindowBinding.h"
 #include "mozilla/RestyleManager.h"
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
 #include "Layers.h"
 #include "imgIContainer.h"
 #include "mozilla/dom/ScriptSettings.h"
@@ -1696,7 +1694,7 @@ nsRefreshDriver::Tick(int64_t aNowEpoch, TimeStamp aNowTime)
 
           nsCOMPtr<nsIPresShell> shellKungFuDeathGrip(shell);
           mStyleFlushObservers.RemoveElement(shell);
-          RestyleManagerHandle restyleManager =
+          RestyleManager* restyleManager =
             shell->GetPresContext()->RestyleManager();
           restyleManager->SetObservingRefreshDriver(false);
           shell->FlushPendingNotifications(ChangesToFlush(Flush_Style, false));
diff --git a/layout/generic/nsFirstLetterFrame.cpp b/layout/generic/nsFirstLetterFrame.cpp
index f436245929..c45cd5f4b6 100644
--- a/layout/generic/nsFirstLetterFrame.cpp
+++ b/layout/generic/nsFirstLetterFrame.cpp
@@ -13,8 +13,7 @@
 #include "nsGkAtoms.h"
 #include "nsStyleSet.h"
 #include "nsFrameManager.h"
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 #include "nsPlaceholderFrame.h"
 #include "nsCSSFrameConstructor.h"
 
@@ -81,7 +80,7 @@ nsFirstLetterFrame::SetInitialChildList(ChildListID  aListID,
 {
   MOZ_ASSERT(aListID == kPrincipalList, "Principal child list is the only "
              "list that nsFirstLetterFrame should set via this function");
-  RestyleManagerHandle restyleManager = PresContext()->RestyleManager();
+  RestyleManager* restyleManager = PresContext()->RestyleManager();
 
   for (nsFrameList::Enumerator e(aChildList); !e.AtEnd(); e.Next()) {
     NS_ASSERTION(e.get()->GetParent() == this, "Unexpected parent");
diff --git a/layout/generic/nsFrame.cpp b/layout/generic/nsFrame.cpp
index 8c92705152..27b75dce32 100644
--- a/layout/generic/nsFrame.cpp
+++ b/layout/generic/nsFrame.cpp
@@ -42,8 +42,6 @@
 #include "nsLayoutUtils.h"
 #include "LayoutLogging.h"
 #include "mozilla/RestyleManager.h"
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
 
 #include "nsIDOMNode.h"
 #include "nsISelection.h"
@@ -677,7 +675,7 @@ nsFrame::DestroyFrom(nsIFrame* aDestructRoot)
     // because what matters is whether the new style (not the old)
     // specifies CSS transitions.
     RestyleManager::ReframingStyleContexts* rsc =
-      presContext->RestyleManager()->AsGecko()->GetReframingStyleContexts();
+      presContext->RestyleManager()->GetReframingStyleContexts();
     if (rsc) {
       rsc->Put(mContent, mStyleContext);
     }
@@ -688,7 +686,7 @@ nsFrame::DestroyFrom(nsIFrame* aDestructRoot)
     // If no new frame for this element is created by the end of the
     // restyling process, stop animations and transitions for this frame
     RestyleManager::AnimationsWithDestroyedFrame* adf =
-      presContext->RestyleManager()->AsGecko()->GetAnimationsWithDestroyedFrame();
+      presContext->RestyleManager()->GetAnimationsWithDestroyedFrame();
     // AnimationsWithDestroyedFrame only lives during the restyling process.
     if (adf) {
       adf->Put(mContent, mStyleContext);
diff --git a/layout/generic/nsInlineFrame.cpp b/layout/generic/nsInlineFrame.cpp
index c15e33cb6c..ed6e6027dc 100644
--- a/layout/generic/nsInlineFrame.cpp
+++ b/layout/generic/nsInlineFrame.cpp
@@ -14,8 +14,7 @@
 #include "nsPresContext.h"
 #include "nsRenderingContext.h"
 #include "nsCSSAnonBoxes.h"
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 #include "nsDisplayList.h"
 #include "mozilla/Likely.h"
 #include "SVGTextFrame.h"
@@ -346,7 +345,7 @@ ReparentChildListStyle(nsPresContext* aPresContext,
                        const nsFrameList::Slice& aFrames,
                        nsIFrame* aParentFrame)
 {
-  RestyleManagerHandle restyleManager = aPresContext->RestyleManager();
+  RestyleManager* restyleManager = aPresContext->RestyleManager();
 
   for (nsFrameList::Enumerator e(aFrames); !e.AtEnd(); e.Next()) {
     NS_ASSERTION(e.get()->GetParent() == aParentFrame, "Bogus parentage");
@@ -493,7 +492,7 @@ nsInlineFrame::DrainSelfOverflowListInternal(DrainFlags aFlags)
     if (!(aFlags & eDontReparentFrames)) {
       nsIFrame* firstChild = overflowFrames->FirstChild();
       const bool doReparentSC = (aFlags & eInFirstLine);
-      RestyleManagerHandle restyleManager = PresContext()->RestyleManager();
+      RestyleManager* restyleManager = PresContext()->RestyleManager();
       for (nsIFrame* f = firstChild; f; f = f->GetNextSibling()) {
         f->SetParent(this);
         if (doReparentSC) {
@@ -560,7 +559,7 @@ nsInlineFrame::ReflowFrames(nsPresContext* aPresContext,
 
   nsLineLayout* lineLayout = aReflowInput.mLineLayout;
   bool inFirstLine = aReflowInput.mLineLayout->GetInFirstLine();
-  RestyleManagerHandle restyleManager = aPresContext->RestyleManager();
+  RestyleManager* restyleManager = aPresContext->RestyleManager();
   WritingMode frameWM = aReflowInput.GetWritingMode();
   WritingMode lineWM = aReflowInput.mLineLayout->mRootSpan->mWritingMode;
   LogicalMargin framePadding = aReflowInput.ComputedLogicalBorderPadding();
diff --git a/layout/mathml/nsMathMLmtableFrame.cpp b/layout/mathml/nsMathMLmtableFrame.cpp
index 4bd7d43951..ad4bb55682 100644
--- a/layout/mathml/nsMathMLmtableFrame.cpp
+++ b/layout/mathml/nsMathMLmtableFrame.cpp
@@ -16,8 +16,7 @@
 #include "nsTableFrame.h"
 #include "celldata.h"
 
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 #include <algorithm>
 
 #include "nsIScriptError.h"
diff --git a/layout/style/AnimationCollection.cpp b/layout/style/AnimationCollection.cpp
index 23a3e1a666..043b66d681 100644
--- a/layout/style/AnimationCollection.cpp
+++ b/layout/style/AnimationCollection.cpp
@@ -5,8 +5,7 @@
 
 #include "mozilla/AnimationCollection.h"
 
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 #include "nsAnimationManager.h" // For dom::CSSAnimation
 #include "nsPresContext.h"
 #include "nsTransitionManager.h" // For dom::CSSTransition
@@ -138,7 +137,7 @@ AnimationCollection<AnimationType>::UpdateCheckGeneration(
   nsPresContext* aPresContext)
 {
   mCheckGeneration =
-    aPresContext->RestyleManager()->AsGecko()->GetAnimationGeneration();
+    aPresContext->RestyleManager()->GetAnimationGeneration();
 }
 
 template<class AnimationType>
diff --git a/layout/style/nsHTMLCSSStyleSheet.cpp b/layout/style/nsHTMLCSSStyleSheet.cpp
index 4f68e6741b..0246d6651a 100644
--- a/layout/style/nsHTMLCSSStyleSheet.cpp
+++ b/layout/style/nsHTMLCSSStyleSheet.cpp
@@ -19,8 +19,7 @@
 #include "nsAttrValue.h"
 #include "nsAttrValueInlines.h"
 #include "nsCSSPseudoElements.h"
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 
 using namespace mozilla;
 using namespace mozilla::dom;
@@ -73,7 +72,7 @@ nsHTMLCSSStyleSheet::ElementRulesMatching(nsPresContext* aPresContext,
 
   declaration = aElement->GetSMILOverrideStyleDeclaration();
   if (declaration) {
-    RestyleManager* restyleManager = aPresContext->RestyleManager()->AsGecko();
+    RestyleManager* restyleManager = aPresContext->RestyleManager();
     if (!restyleManager->SkipAnimationRules()) {
       // Animation restyle (or non-restyle traversal of rules)
       // Now we can walk SMIL overrride style, without triggering transitions.
diff --git a/layout/style/nsHTMLStyleSheet.cpp b/layout/style/nsHTMLStyleSheet.cpp
index 70a5c7f414..94b727bcc9 100644
--- a/layout/style/nsHTMLStyleSheet.cpp
+++ b/layout/style/nsHTMLStyleSheet.cpp
@@ -34,8 +34,7 @@
 #include "mozilla/dom/Element.h"
 #include "nsHashKeys.h"
 #include "mozilla/OperatorNewExtensions.h"
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 
 using namespace mozilla;
 using namespace mozilla::dom;
diff --git a/layout/style/nsStyleSet.cpp b/layout/style/nsStyleSet.cpp
index 9495b788df..a27dccc4b8 100644
--- a/layout/style/nsStyleSet.cpp
+++ b/layout/style/nsStyleSet.cpp
@@ -40,8 +40,7 @@
 #include "nsCSSRules.h"
 #include "nsPrintfCString.h"
 #include "nsIFrame.h"
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 #include "nsQueryObject.h"
 
 #include <inttypes.h>
@@ -1755,7 +1754,7 @@ nsStyleSet::ResolveStyleWithoutAnimation(dom::Element* aTarget,
              pseudoType == CSSPseudoElementType::before ||
              pseudoType == CSSPseudoElementType::after,
              "unexpected type for animations");
-  RestyleManager* restyleManager = PresContext()->RestyleManager()->AsGecko();
+  RestyleManager* restyleManager = PresContext()->RestyleManager();
 
   bool oldSkipAnimationRules = restyleManager->SkipAnimationRules();
   restyleManager->SetSkipAnimationRules(true);
@@ -2235,7 +2234,7 @@ nsStyleSet::ReparentStyleContext(nsStyleContext* aStyleContext,
   CSSPseudoElementType pseudoType = aStyleContext->GetPseudoType();
   nsRuleNode* ruleNode = aStyleContext->RuleNode();
 
-  NS_ASSERTION(!PresContext()->RestyleManager()->AsGecko()->SkipAnimationRules(),
+  NS_ASSERTION(!PresContext()->RestyleManager()->SkipAnimationRules(),
                "we no longer handle SkipAnimationRules()");
 
   nsRuleNode* visitedRuleNode = nullptr;
@@ -2515,5 +2514,5 @@ nsStyleSet::ClearSelectors()
   if (!mRuleTree) {
     return;
   }
-  PresContext()->RestyleManager()->AsGecko()->ClearSelectors();
+  PresContext()->RestyleManager()->ClearSelectors();
 }
diff --git a/layout/style/nsTransitionManager.cpp b/layout/style/nsTransitionManager.cpp
index 8590501c79..a2e97e2d28 100644
--- a/layout/style/nsTransitionManager.cpp
+++ b/layout/style/nsTransitionManager.cpp
@@ -31,8 +31,7 @@
 #include "nsDisplayList.h"
 #include "nsStyleChangeList.h"
 #include "nsStyleSet.h"
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 #include "nsDOMMutationObserver.h"
 
 using mozilla::TimeStamp;
@@ -503,7 +502,7 @@ nsTransitionManager::StyleContextChanged(dom::Element *aElement,
 
   if (collection &&
       collection->mCheckGeneration ==
-        mPresContext->RestyleManager()->AsGecko()->GetAnimationGeneration()) {
+        mPresContext->RestyleManager()->GetAnimationGeneration()) {
     // When we start a new transition, we immediately post a restyle.
     // If the animation generation on the collection is current, that
     // means *this* is that restyle, since we bump the animation
@@ -914,7 +913,7 @@ nsTransitionManager::ConsiderInitiatingTransition(
     OwningElementRef(*aElement, aNewStyleContext->GetPseudoType()));
   animation->SetTimelineNoUpdate(timeline);
   animation->SetCreationSequence(
-    mPresContext->RestyleManager()->AsGecko()->GetAnimationGeneration());
+    mPresContext->RestyleManager()->GetAnimationGeneration());
   animation->SetEffectFromStyle(pt);
   animation->PlayFromStyle();
 
diff --git a/layout/svg/nsSVGContainerFrame.cpp b/layout/svg/nsSVGContainerFrame.cpp
index 5c18cad425..84f79eaf83 100644
--- a/layout/svg/nsSVGContainerFrame.cpp
+++ b/layout/svg/nsSVGContainerFrame.cpp
@@ -7,8 +7,7 @@
 #include "nsSVGContainerFrame.h"
 
 // Keep others in (case-insensitive) order:
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 #include "nsCSSFrameConstructor.h"
 #include "nsSVGEffects.h"
 #include "nsSVGElement.h"
diff --git a/layout/svg/nsSVGEffects.cpp b/layout/svg/nsSVGEffects.cpp
index ca4c5778ce..63fd215190 100644
--- a/layout/svg/nsSVGEffects.cpp
+++ b/layout/svg/nsSVGEffects.cpp
@@ -7,8 +7,7 @@
 #include "nsSVGEffects.h"
 
 // Keep others in (case-insensitive) order:
-#include "mozilla/RestyleManagerHandle.h"
-#include "mozilla/RestyleManagerHandleInlines.h"
+#include "mozilla/RestyleManager.h"
 #include "nsCSSFrameConstructor.h"
 #include "nsISupportsImpl.h"
 #include "nsSVGClipPathFrame.h"