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/ShadowRoot.cpp

@@ -565,7 +565,7 @@ ShadowRoot::ChangePoolHost(nsIContent* aNewHost)
 bool
 ShadowRoot::IsShadowInsertionPoint(nsIContent* aContent)
 {
-  if (aContent && aContent->IsHTML(nsGkAtoms::shadow)) {
+  if (aContent && aContent->IsHTMLElement(nsGkAtoms::shadow)) {
     HTMLShadowElement* shadowElem = static_cast<HTMLShadowElement*>(aContent);
     return shadowElem->IsInsertionPoint();
   }
@@ -597,7 +597,7 @@ ShadowRoot::IsPooledNode(nsIContent* aContent, nsIContent* aContainer,
     return true;
   }
 
-  if (aContainer && aContainer->IsHTML(nsGkAtoms::content)) {
+  if (aContainer && aContainer->IsHTMLElement(nsGkAtoms::content)) {
     // Fallback content will end up in pool if its parent is a child of the host.
     HTMLContentElement* content = static_cast<HTMLContentElement*>(aContainer);
     return content->IsInsertionPoint() && content->MatchedNodes().IsEmpty() &&