bug 1098126 re-enable mediasource-redundant-seek and mediasource-duration with new results

--HG--
extra : rebase_source : 441f0ee88fc96c3f81628ab2f65b2d082b3bb4df
bug 975782 bring media resource loads out of background while they delay the load event r=cpearce

This will happen after a stalled load doesn't delay the load event but such a
load then delays the load event again when it receives progress.

--HG--
extra : rebase_source : a04dd7416f86306cfc62aabba20fb30415572d98
bug 975782 stop delaying the load event when media fetch has stalled r=cpearce,f=kinetik

--HG--
extra : rebase_source : c26dcd4221ba051ffff417631ae7ad9b7b65995d
No bug, Automated HSTS preload list update from host b-linux64-ix-0002 - a=hsts-update
No bug, Automated HPKP preload list update from host b-linux64-ix-0002 - a=hpkp-update
No bug, Automated blocklist update from host b-linux64-ix-0002 - a=blocklist-update
Bug 1114574 - Refactor and improve MCompare::tryFold. r=h4writer
Bug 1103314 - Clarify label of "Remove All Cookies" button to indicate whether it removes all cookies or just removes the cookies shown. r=dao
Bug 1115327 - Changed FrameMetrics.mScrollableRect to be accessible by getter/setter methods. r=kats
Bug 1115847 - Commit correct version of patch from bug 1100337. (r=me)
Bug 1114587 - Bail out in-place for debug mode in exception handler even if there's no pending exception, so that the DebugEpilogue is called. (r=nbp)
Bug 1112780. Recreate the RenderTargetView on demand. r=jgilbert

This avoids reusing the RenderTargetView across AcquireSync/ReleaseSync pairs
and fixes bug 1109718. It adds a ReleaseSync call to ANGLE
that causes it to invalidate the RenderTargetView.

--HG--
extra : rebase_source : 993a437f5d1e1bfda32ef995b09f216930f174e1
Merge m-i to m-c, a=merge
Merge b-i to m-c, a=merge
Merge f-t to m-c, a=merge