import changes from rmottola/Arctic-Fox:

- Bug 940273 - Part 1 - Fetch changes from maple twig to support Service Worker Cache. (5f8e82dd7)
- Bug 940273 - Part 1b - Expose nsFileProtocolHandler.h in mozilla/net. (71a3ebcf4)
- Bug 940273 - Part 2 - Add a pref to enable Service Worker Cache. (2e7b478d3)
- patch header include (3b90a9b8d)
- override -> MOZ_OVERRIDE (8f51321bc)
- override -> MOZ_OVERRIDE (5f4ab5143)
- Bug 1136563 - ARIA 1.1: Support role 'switch' (2484c9c27)
- Bug 1121518 - ARIA 1.1: Add support for role 'searchbox' (8d3ee1204)
- override -> MOZ_OVERRIDE (3db7a0cb4)
- Bug 1137714 - Make roleDescription nicer/correct/faster (da6beb861)
- Bug 1134280 - Get rid of Tag() - patch 1 - Is{HTML,XUL,MathML,SVG}Element and IsAnyOf{HTML,XUL,MathML,SVG}Elements (133801ca1)
- Bug 1134280 - Get rid of Tag() - patch 2.1 - /accessible - Fix all the occurrences (fbef71d88)
- Bug 1134280 - Get rid of Tag() - patch 2.2 - /editor - Fix all the occurrences (e54a21dcc)
- Bug 1134280 - Get rid of Tag() - patch 2.3 - dom/base and docshell - Fix all the occurrences (8bf192106)
- Bug 1134280 - Get rid of Tag() - patch 2.4 - layout/mathml - Fix all the occurrences (7914f351d)
- Bug 1134280 - Get rid of Tag() - patch 2.5 - dom/xul - Fix all the occurrences (6611b95ef)
- Bug 1134280 - Get rid of Tag() - patch 2.6 - layout/base and layout/form - Fix all the occurrences (61e06ff31)
- Bug 1134280 - Get rid of Tag() - patch 2.7 - layout/generic - Fix all the occurrences (bbe5865c2)
- Bug 1134280 - Get rid of Tag() - patch 2.8 - dom/html - Fix all the occurrences (7af471da5)
- Bug 1134280 - Get rid of Tag() - patch 2.9 - dom/svg, dom/xml, dom/xslt and dom/xbl - Fix all the occurrences (ab9769748)
- Bug 1134280 - Get rid of Tag() - patch 2.10 - dom/events, dom/mathml, dom/plugins, dom/smil - Fix all the occurrences (421ba62f4)
- Bug 1134280 - Get rid of Tag() - patch 2.11 - layout/xul - Fix all the occurrences (e19e64b2c)
- Bug 1134280 - Get rid of Tag() - patch 2.12 - layout/style, layout/svg - Fix all the occurrences (7ec90f520)
- Bug 1134280 - Get rid of Tag() - patch 2.13 - Fix all the occurrences (a887a4341)
- Bug 1134280 - Get rid of Tag() - patch 3 - nsContentUtils::IsHTMLBlock should work with nsIContent inste nsIAtom (28fa04521)
- Bug 1134280 - Get rid of Tag() - patch 4 - Get rid of nsDocumentEncoder::IsTag (ed4bf4d48)
- Bug 1134280 - Get rid of Tag() - patch 5 - nsGenericHTMLElement::IsHTMLElement (70a2822c7)
- Bug 1134280 - Get rid of Tag() - patch 6 - Remove nsINode::Tag() (85885131f)
- Bug 1134280 - Get rid of Tag() - patch 7 - Followup to fix bustage. (actuall, backport, it was missing) (cfcfa3e74)
- Bug 1134280 - Get rid of Tag() - patch 8 - Fixed a debug-only compilation issue (502319995)
- Bug 1356843 - Fix -Wcomma warnings in dom/base/ and dom/xml/. clang's -Wcomma warning warns about suspicious use of the comma operator such as between two statements or to call a function for side effects within an expression. (0f1ad0554)

dom/base/nsDocument.cpp

@@ -626,7 +626,7 @@ nsIdentifierMapEntry::RemoveIdElement(Element* aElement)
   // This could fire in OOM situations
   // Only assert this in HTML documents for now as XUL does all sorts of weird
   // crap.
-  NS_ASSERTION(!aElement->OwnerDoc()->IsHTML() ||
+  NS_ASSERTION(!aElement->OwnerDoc()->IsHTMLDocument() ||
                mIdContentList.IndexOf(aElement) >= 0,
                "Removing id entry that doesn't exist");
 
@@ -5473,7 +5473,7 @@ nsIDocument::CreateElement(const nsAString& aTagName, ErrorResult& rv)
     return nullptr;
   }
 
-  bool needsLowercase = IsHTML() && !IsLowercaseASCII(aTagName);
+  bool needsLowercase = IsHTMLDocument() && !IsLowercaseASCII(aTagName);
   nsAutoString lcTagName;
   if (needsLowercase) {
     nsContentUtils::ASCIIToLower(aTagName, lcTagName);
@@ -5497,7 +5497,7 @@ nsDocument::SetupCustomElement(Element* aElement,
     return;
   }
 
-  nsCOMPtr<nsIAtom> tagAtom = aElement->Tag();
+  nsCOMPtr<nsIAtom> tagAtom = aElement->NodeInfo()->NameAtom();
   nsCOMPtr<nsIAtom> typeAtom = aTypeExtension ?
     do_GetAtom(*aTypeExtension) : tagAtom;
 
@@ -5676,7 +5676,7 @@ already_AddRefed<CDATASection>
 nsIDocument::CreateCDATASection(const nsAString& aData,
                                 ErrorResult& rv)
 {
-  if (IsHTML()) {
+  if (IsHTMLDocument()) {
     rv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
     return nullptr;
   }
@@ -6134,7 +6134,7 @@ nsDocument::RegisterElement(JSContext* aCx, const nsAString& aType,
   // Only convert NAME to lowercase in HTML documents. Note that NAME is
   // options.extends.
   nsAutoString lcName;
-  if (IsHTML()) {
+  if (IsHTMLDocument()) {
     nsContentUtils::ASCIIToLower(aOptions.mExtends, lcName);
   } else {
     lcName.Assign(aOptions.mExtends);
@@ -6328,15 +6328,12 @@ nsDocument::RegisterElement(JSContext* aCx, const nsAString& aType,
       // Make sure that the element name matches the name in the definition.
       // (e.g. a definition for x-button extending button should match
       // <button is="x-button"> but not <x-button>.
-      // Note: we also check the tag name, because if it's not the above
-      // mentioned case, it can be that only the |is| property has been
-      // changed, which we should ignore by the spec.
-      if (elem->NodeInfo()->NameAtom() != nameAtom &&
-          elem->Tag() == nameAtom) {
+      if (elem->NodeInfo()->NameAtom() != nameAtom) {
         //Skip over this element because definition does not apply.
         continue;
       }
 
+      MOZ_ASSERT(elem->IsHTMLElement(nameAtom));
       nsWrapperCache* cache;
       CallQueryInterface(elem, &cache);
       MOZ_ASSERT(cache, "Element doesn't support wrapper cache?");
@@ -7003,7 +7000,7 @@ Element*
 nsIDocument::GetHtmlElement() const
 {
   Element* rootElement = GetRootElement();
-  if (rootElement && rootElement->IsHTML(nsGkAtoms::html))
+  if (rootElement && rootElement->IsHTMLElement(nsGkAtoms::html))
     return rootElement;
   return nullptr;
 }
@@ -7020,7 +7017,7 @@ nsIDocument::GetHtmlChildElement(nsIAtom* aTag)
   for (nsIContent* child = html->GetFirstChild();
        child;
        child = child->GetNextSibling()) {
-    if (child->IsHTML(aTag))
+    if (child->IsHTMLElement(aTag))
       return child->AsElement();
   }
   return nullptr;
@@ -7080,7 +7077,7 @@ nsDocument::GetTitle(nsString& aTitle)
       break;
 #endif
     case kNameSpaceID_SVG:
-      if (rootElement->Tag() == nsGkAtoms::svg) {
+      if (rootElement->IsSVGElement(nsGkAtoms::svg)) {
         GetTitleFromElement(kNameSpaceID_SVG, tmp);
         break;
       } // else fall through
@@ -7207,7 +7204,7 @@ nsDocument::GetBoxObjectFor(Element* aElement, ErrorResult& aRv)
     return nullptr;
   }
 
-  if (!mHasWarnedAboutBoxObjects && !aElement->IsXUL()) {
+  if (!mHasWarnedAboutBoxObjects && !aElement->IsXULElement()) {
     mHasWarnedAboutBoxObjects = true;
     nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
                                     NS_LITERAL_CSTRING("BoxObjects"), this,
@@ -8158,7 +8155,7 @@ nsDocument::FlushPendingNotifications(mozFlushType aType)
   // make sure that layout is started as needed.  But we can skip that
   // part if we have no presshell or if it's already done an initial
   // reflow.
-  if ((!IsHTML() ||
+  if ((!IsHTMLDocument() ||
        (aType > Flush_ContentAndNotify && mPresShell &&
         !mPresShell->DidInitialize())) &&
       (mParser || mWeakSink)) {
@@ -8331,7 +8328,7 @@ nsRadioGroupStruct*
 nsDocument::GetRadioGroupInternal(const nsAString& aName) const
 {
 #ifdef DEBUG
-  if (IsHTML()) {
+  if (IsHTMLDocument()) {
     nsAutoString lcName;
     ToLowerCase(aName, lcName);
     MOZ_ASSERT(aName == lcName);
@@ -8350,7 +8347,7 @@ nsRadioGroupStruct*
 nsDocument::GetRadioGroup(const nsAString& aName) const
 {
   nsAutoString tmKey(aName);
-  if (IsHTML()) {
+  if (IsHTMLDocument()) {
     ToLowerCase(tmKey); //should case-insensitive.
   }
 
@@ -8361,7 +8358,7 @@ nsRadioGroupStruct*
 nsDocument::GetOrCreateRadioGroup(const nsAString& aName)
 {
   nsAutoString tmKey(aName);
-  if (IsHTML()) {
+  if (IsHTMLDocument()) {
     ToLowerCase(tmKey); //should case-insensitive.
   }
 
@@ -8431,7 +8428,7 @@ nsDocument::GetNextRadioButton(const nsAString& aName,
     else if (++index >= numRadios) {
       index = 0;
     }
-    NS_ASSERTION(static_cast<nsGenericHTMLFormElement*>(radioGroup->mRadioButtons[index])->IsHTML(nsGkAtoms::input),
+    NS_ASSERTION(static_cast<nsGenericHTMLFormElement*>(radioGroup->mRadioButtons[index])->IsHTMLElement(nsGkAtoms::input),
                  "mRadioButtons holding a non-radio button");
     radio = static_cast<HTMLInputElement*>(radioGroup->mRadioButtons[index]);
   } while (radio->Disabled() && radio != currentRadio);