Bug 839376 (part 3) - Some low-hanging exact rooting fruit.  sfink.

--HG--
extra : rebase_source : 1d236895915f9474fd8e50c399bf2cd8139a6b5f
Bug 784730 - Crash in ReparentWrapperIfFound if wrapper already in scope. r=bholley
Bug 752401 - Drain timing and error handling fixes for PulseAudio cubeb backend.  r=doublec,jesup
Export MediaBufferDecoder.h, no bug
Bug 837373 - Check for valid favicon before scaling it. r=mfinkle
Backed out changeset 3c4205be7191 (bug 823236) for M2 failures
Bug 834266 - Use XPCNativeWrapper to compare elements, r=mdas
Bug 834492 - Drop livemarks support from FUEL. r=mak
Bug 837427 - Include gstreamer cflags in content/media/webaudio; r=ehsan
Bug 837870 - mozbase README.md -> m-c, remove m-c README;r=wlach

--HG--
extra : rebase_source : a6758168b7525d5594c9ca597b78eadd45e368e5
Backed out changeset 7fc9c8f622c5 (bug 837870) because it broke the build, landing on a CLOSED TREE
bug 838261 - stop downloading imgtec-panda-imm76i-67545da7.tgz from the internet. r=catlee CLOSED TREE
Bug 834931 - Add fullscreen buttons to video controls. r=mleibovic, a=tef+
Bug 836644 - Update emulator for b2g tests. r=aki
Bug 826685 - Web Console and Inspector font is (much) larger than Debugger and StyleEditor font (sourceeditor). r=msucan
Merge the last PGO-green inbound changeset to m-c.
Bug 834618 - Catch any error thrown from resolveFromOrigin. r=fabrice
merge m-c to fx-team
Bug 836506 - Set the version on mozilla-central/master to 2.0.0.0-prerelease. r=fabrice
Merge m-c to inbound.