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)

docshell/base/nsDocShell.cpp

@@ -352,11 +352,7 @@ IsElementAnchor(nsIContent* aContent)
 {
   // Make sure we are dealing with either an <A> or <AREA> element in the HTML
   // or XHTML namespace.
-  if (!aContent->IsHTML()) {
-    return false;
-  }
-  nsIAtom* nameAtom = aContent->Tag();
-  return nameAtom == nsGkAtoms::a || nameAtom == nsGkAtoms::area;
+  return aContent->IsAnyOfHTMLElements(nsGkAtoms::a, nsGkAtoms::area);
 }
 
 static void
@@ -2656,7 +2652,7 @@ nsDocShell::GetFullscreenAllowed(bool* aFullscreenAllowed)
   }
   nsCOMPtr<Element> frameElement = win->GetFrameElementInternal();
   if (frameElement &&
-      frameElement->IsHTML(nsGkAtoms::iframe) &&
+      frameElement->IsHTMLElement(nsGkAtoms::iframe) &&
       !frameElement->HasAttr(kNameSpaceID_None, nsGkAtoms::allowfullscreen) &&
       !frameElement->HasAttr(kNameSpaceID_None, nsGkAtoms::mozallowfullscreen)) {
     return NS_OK;
@@ -13632,7 +13628,8 @@ nsDocShell::OnLinkClickSync(nsIContent* aContent,
   // XXX When the linking node was HTMLFormElement, it is synchronous event.
   //     That is, the caller of this method is not |OnLinkClickEvent::Run()|
   //     but |HTMLFormElement::SubmitSubmission(...)|.
-  if (nsGkAtoms::form == aContent->Tag() && ShouldBlockLoadingForBackButton()) {
+  if (aContent->IsHTMLElement(nsGkAtoms::form) &&
+      ShouldBlockLoadingForBackButton()) {
     return NS_OK;
   }
 
@@ -13662,7 +13659,7 @@ nsDocShell::OnLinkClickSync(nsIContent* aContent,
 
   uint32_t flags = INTERNAL_LOAD_FLAGS_NONE;
   if (IsElementAnchor(aContent)) {
-    MOZ_ASSERT(aContent->IsHTML());
+    MOZ_ASSERT(aContent->IsHTMLElement());
     nsAutoString referrer;
     aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::rel, referrer);
     nsWhitespaceTokenizerTemplate<nsContentUtils::IsHTMLWhitespace> tok(referrer);