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

- Bug 1161913 - Part 2. Request canvas to push out its next drawn frame instead of pulling it. r=mt (b2ddcd68c3)
- Bug 1161913 - Part 3 - Relax requestFrame ordering guarantee in tests. r=mt (8bc69b9fc4)
- Bug 1176945 - Remove unnecessary hwc reference from gl r=jgilbert (8f1ac06d99)
- spaces and restore XP specific (ac03acf252)
- reinstantiate some gfx log (d7deb9c3bd)
- Bug 1191042 - Use CreateOffscreen for WebGL instead of CreateHeadless. - r=jrmuizel (f98fd02e59)
- space (ad72b4f071)
- Bug 1183085 - Remove EndConstruction() from layer documentation; r=roc (b1ef791fea)
- Bug 771288 - Multiprocess FileHandle support (FileHandle on PBackground); r=baku (f77ab5b9c3)
- Bug 1202788 - Upgrade object_data table to new format (follow-up to bug 871846). r=janv (ea86fd2890)
- Bug 1204183 - Test the object_data upgrade from bug 1202788. r=janv (5a48cfdf17)
- Bug 1198814 - Use StructuredCloneHelper in PromiseWorkerProxy, r=smaug (10e9f33700)
- namespace name (b4feaf8e67)
- Bug 1203561 - Use StructuredCloneHelper in StackScopedCloneData, r=smaug (156525cf32)
- Bug 1209919 - Improving naming and comments in StructuredCloneHelper, r=smaug (f177bca203)
- Bug 1167100 - User originAttribute in ContentPrincipalInfo. r=bholley (340c3d606e)
- Bug 1182197 investigation patch. Log the stack at promise fulfillment on a CCed promise into the crash reporter data. r=dmajor,nsm (376c1bba93)
- Bug 1183907, properly wrappercache worker URL object, r=baku (d71937b9d0)
- Bug 1203463 - URL constructor should support about:blank URI, r=bz (d539b63667)
- Bug 1207496 - Part 4: Remove use of expression closure from services/sync/. r=gps (f1eae787d9)
- Bug 1207496 - Part 3: Remove use of expression closure from services/fxaccounts/. r=markh (f60e64c061)
- Bug 1207496 - Part 2: Remove use of expression closure from services/crypt/. r=mrbkap (ec2738f497)
- Bug 1207496 - Part 1: Remove use of expression closure from services/common/. r=gps (3464407503)
- Bug 1134881 - Sync password timeCreated & timePasswordChanged fields. r=rnewman (96befc78b2)
- adapted version of Bug 753289 - Pre: rename WEAVE_SYNC_PREFS to PREF_SYNC_PREFS_PREFIX. (5987671e36)

dom/ipc/StructuredCloneData.cpp

@@ -70,7 +70,7 @@ StructuredCloneData::Write(JSContext* aCx,
 {
   MOZ_ASSERT(!mData);
 
-  StructuredCloneHelper::Write(aCx, aValue, aRv);
+  StructuredCloneHolder::Write(aCx, aValue, aRv);
   if (NS_WARN_IF(aRv.Failed())) {
     return;
   }