Bug 795254. Intermittent test_private_channel.js failure r=jdm

--HG--
rename : netwerk/test/unit/test_private_channel.js => netwerk/test/unit/test_private_necko_channel.js
Bug 848020 - Do we really have to poison NtFlushBuffersFile? r=BenWa.
Bug 841059 - Make Cell::chunk and Cell::address private; r=billm

--HG--
extra : rebase_source : e6800f71b6950af84b56c541fe6dbdeb8f62abdf
Bug 841059 - Do not use the ArenaHeader for sizeOfThis on JSObject; r=billm

--HG--
extra : rebase_source : 6d14d5dca727703166c1cdcc694ec688223e6692
Bug 848599 - Implement DisableGenerationalGC like DisableIncrementalGC; r=billm

--HG--
extra : rebase_source : aad333f9196a74e4579be70bd2ebf62fe16f23ed
Bug 848608 - Make eagerlyTraceWeakMaps an enum; r=billm

--HG--
extra : rebase_source : 20558f611dda644f966d4660b88895a0cbc5c7d1
Bug 848612 - Don't store strings in the store buffer; r=billm

--HG--
extra : rebase_source : f287f6b0945bc0a84ac1acfef9fcad985591db82
Testcase from bug 847127, r=ehsan
Set the AncestorHasDirAuto flag for all new text nodes that need it. Bug 847127, r=ehsan
Make sure not to return the old text node in ResetNodeDirection. Bug 845093, r=ehsan
Move WalkDescendantsClearAncestorDirAuto from BeforeSetAttr to OnSetDirAttr to simplify the test for elements that had dir=auto but no longer do, especially <bdi>. Bug 845093, r=ehsan