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

- Bug 1161590 - Ignore blocklist preference in nightly and aurora. r=jrmuizelaar (47ec8bee6)
- Bug 1162299 - Distinguish between all features and unrecognized feature. r=kats (e9705844f)
- Add compositor, layers, and rendering info to nsIGfxInfo. (bug 1179051 part 5, r=mattwoodrow) (b4e6da05f)
- Bug 1186002. Avoid testing for recreate on broken drivers. r=dvander (10506f4f2)
- Bug 1156407 - part 1 - use static_assert instead of PR_STATIC_ASSERT; r=mccr8 (ff53e05ba)
- Bug 1156407 - part 2 - make CALLBACK_TYPE enum a private implementation detail of nsTimerImpl; r=mccr8 (de0cc6527)
- Bug 1156407 - part 3 - get rid of NS_NewTimer; r=mccr8 (c598b96e0)
- Bug 1095433: fix the race condition in the Task Tracer that crashes processes forked from Nuwa. r=tlee (cffe07827)
- Bug 1113562 - Expected delay time of tasks should not be the latency of those kind. r=sinker (f422ae04e)
- Bug 1155059: Patch 1&2 - Convert Dispatch() and friends to already_AddRefed<> r=froydnj (2ca9850af)
- Bug 1155059: Patch 4 - invoke NS_ASSERTION if DispatchToMainThread fails to get MainThread ptr r=froydnj (651903c22)
- Bug 1155059: Patch 3&7 - fix leaks in Promise, ConsoleService and JS Finalize r=froydnj (b57cb08d9)
- Bug 1155059: Patch 5 - clean up ServiceWorkers and avoid leaks r=nikhil (666245af8)
- Bug 1155059: Patch 6 - fix problems with gfxFontInfoLoader shutdown sequence r=jdaggett (332e8bd76)
- Bug 1155059: Patch 8 - Don't leak runnables when MediaCache/FileBlockCache get shut down after XPCOM is in final shutdown r=cpearce (18f36fa25)
- Bug 1155059: Patch 9 - Modify DataChannel.cpp to use updated API r=froydnj (c5415703c)
- Bug 1176446 - TextureClientD3D11 should take into account the layer backend when allocating a surface. r=bas (3c1b59296)
- Bug 1176363 - Part 1: Stop using DrawTargets off the main thread. r=mattwoodrow (624e8107a)
- Bug 1176363 - Part 2: Allow mapping of SourceSurfaceRawData from multiple threads. r=bas (38c8363cf)
- Fix d3d11 texture sharing checks being preserved across device resets. (bug 1183910 part 6, r=mattwoodrow) (658121c50)
- Clear the blur cache after device resets. (bug 1188032, r=bas) (c362b2ec6)

xpcom/string/nsTSubstring.cpp

@@ -53,7 +53,8 @@ nsTSubstring_CharT::MutatePrep(size_type aCapacity, char_type** aOldData,
   // If |aCapacity > kMaxCapacity|, then our doubling algorithm may not be
   // able to allocate it.  Just bail out in cases like that.  We don't want
   // to be allocating 2GB+ strings anyway.
-  PR_STATIC_ASSERT((sizeof(nsStringBuffer) & 0x1) == 0);
+  static_assert((sizeof(nsStringBuffer) & 0x1) == 0,
+                "bad size for nsStringBuffer");
   const size_type kMaxCapacity =
     (size_type(-1) / 2 - sizeof(nsStringBuffer)) / sizeof(char_type) - 2;
   if (aCapacity > kMaxCapacity) {