import changes from `dev' branch of rmottola/Arctic-Fox:

- Bug 1198572 - Add telemetry for how often HSTS would fix mixed content problems r=smaug r=tanvi (1abeb434a4)
- Bug 1181683 - Mark ping and beacon as blockable mixed content instead of optionally blockable. r=smaug (ab4b612439)
- Bug 1148732 - When checking a document's scheme, check the innermost uri. r=dveditz, smaug (f03eef9b3a)
- put back source RegExp (112cbc1797)
- Bug 1026520 - CSP: Inline report sending into allows - csp changes (r=dveditz) (f835967ad3)
- Bug 1026520 - CSP: Inline report sending into allows - callsite updates (r=dveditz) (39b200f027)
- Bug 1026520 - CSP: Inline report sending into allows - test updates (r=dveditz) (6a9dd4d859)
- Bug 1201822 - Update web-platform-tests expected data to revision d0571e01e1a2e4b8c5f696af2f81cbc1be9a5842, a=testonly (851485e4f9)
- Bug 1026520 - CSP: Inline report sending into allows - web platform test updates (r=deveditz) (0fbb9ce2c7)
- Bug 1612470 - Remove Document.hasScriptsBlockedBySandbox and Document.inlineScriptAllowedByCSP. r=bzbarsky (840ec6ebfb)
- Bug 1192333 - Use channel->ascynOpen2 in dom/xslt/xslt/txMozillaStyleheetCompiler.cpp (r=sicking) (73989dc9d2)
- Bug 1186843 - Don't recreate message manager. r=smaug (d4e2e28136)
- Bug 1209361 - Add missing includes to dom/base. r=mccr8 (702a9b0c21)
- Bug 1209621 - Add a way to get the TabParent for the content-primary tab, r=mconley (7d8a7e501f)
- Bug 1209001 - Fix OOM handling when creating ModuleObject r=terrence (e5b9fc8db3)
- Bug 1183289 - Run fewer CGC tests r=sfink (d529983340)
- Bug 1204692 - Add arm64-sim variant to the autospider.sh script. r=sstangl (8f46c42105)
- Bug 1183289 - Partially revert previous patch so jstests get run with default jitflags only r=me (97d1721e43)
- Bug 1210924 - Do not fire read barriers when using ReadBarriered in a boolean context; r=sfink (697885508c)
- code style and reshuffle (1b55c0f721)
- Bug 1207821 - Change the initialized length of an unboxed array in some places without triggering pre barriers, r=jandem. (92452a2db0)
- Bug 1074935 - Add SPS pseudo frames for JSRope flattening; r=jandem (5589064dc1)
- Bug 1184423 - Properly report OOM when initializing the RematerizedFrameTable fails; r=shu (60d964e1ca)
- Bug 1201575 - Give copied FrameIter::Data the cx of the current frame. (r=jimb) (af5e59d95a)
- Bug 1204725 - IonMonkey: Check result when copying frame iter data, r=nbp (7de175e301)
- Bug 1184423 - Properly report OOM when adding a rematerialized frame to the current JitActivation fails; r=shu (a00c310833)
- Bug 1210391 - Module scopes are currently not cacheable r=jandem (b42adeb292)
- pointer style (30f967d1ee)
- Bug 1199221 - Implement JS::ubi::Node::size for js::ObjectGroup referents; r=sfink (364cbff290)
- Bug 1199219 - Implement JS::ubi::Node::size for js::Shape referents; r=sfink (683d11d589)
- Bug 1199220 - Implement JS::ubi::Node::size for js::BaseShape referents; r=sfink (a9e1c02cbc)
- Bug 1200482: Make Debugger respect 'enabled' flag when setting allocation tracking hook on debuggee compartments, and check that it does. r=fitzgen (cf203e12e0)
- Bug 1177508 - Truncate the stack more aggressively in adoptAsyncStack. r=fitzgen (c335f6dcd5)
- Bug 1209989 - Implicitly attach a PRThread to native threads when first used as a PRThread in the PosixNSPR implementation. r=terrence (c9d771fb47)
- Bug 1206640: Fix an implicit constructor in PosixNSPR.cpp; r=nbp (178312c0f2)
- Bug 1204863 - Ignore frames from self-hosted scripts; r=shu (4b8cd11832)
- Bug 1180047: Debugger.prototype.findObjects should not return objects that must not be exposed to JS. r=fitzgen (634f19195b)
- Bug 1208908 - Fix a conditional statement in BytecodeRangeWithPosition::updatePosition(); r=ejpbruel (e58c656255)
- some profiler and crash import (d5b8b4f798)
- Bug 1185532: Turn on the NPAPI process sandbox for Windows 64-bit flash by default. r=bsmedberg (5aa8fa8a6e)
- Bug 1194488: Whitelist specific plugins for async init; r=jimm (7c78723689)
- Bug 1200698: Rename async plugin init pref; r=bsmedberg (df37e5833e)
- Bug 1184068: Ensure that mShutdown is not incorrectly set from true to false if plugin crashes during CallNP_Shutdown; r=jimm Bug 1202024: Initialize plugin details and quirks in parent on first run for async init. r=aklotz (934d877d8c)
- missing bit of Bug 1119878 Part 2 (3a0dd8afc1)
- Bug 1209351 (part 6) - Optimize nsTHashTable::RemoveEntry() usage in toolkit/. r=froydnj. (810fbbab89)
- Bug 1209351 (part 1) - Add an overloading of nsTHashTable::RemoveEntry() that takes an already-found entry. r=froydnj. (45d6181461)
- Bug 1209351 (part 2) - Optimize nsTHashTable::RemoveEntry() usage in dom/. r=bz. (bdb19ed49f)
- Bug 1209351 (part 3) - Optimize nsTHashTable::RemoveEntry() usage in gfx/. r=jrmuizel. (dc29a2b97f)
- Bug 1209351 (part 4) - Optimize nsTHashTable::RemoveEntry() usage in netwerk/. r=michal.novotny. (3be1f09b5c)
- Bug 1209351 (part 5) - Optimize nsTHashTable::RemoveEntry() usage in security/. r=keeler. (47999463fe)

dom/base/nsDOMMutationObserver.cpp

@@ -19,6 +19,7 @@
 #include "nsTextFragment.h"
 #include "nsThreadUtils.h"
 
+using mozilla::dom::TreeOrderComparator;
 using mozilla::dom::Animation;
 
 nsAutoTArray<nsRefPtr<nsDOMMutationObserver>, 4>*