Bug 978163 - Part 1: Remove VTTRegionList and VTTRegion TextTrack extensions. r=rillian, r=bz

- These two parts of the spec were recently removed as they
were seen as unecessary or bad design, in the case of the
VTTRegion TextTrack extensions. See the spec bug at:
https://www.w3.org/Bugs/Public/show_bug.cgi?id=24380
Bug 978163 - Part 2: VTTCue should have Region property. r=rillian, r=bz

See spec bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=24380
Bug 978163 - Part 3: Vtt.js should add VTTRegions directly to the VTTCue. r=rillian

See spec bug https://www.w3.org/Bugs/Public/show_bug.cgi?id=24380.
Bug 978173 - Part 4: Add test for VTTCue::Region. r=rillian

Updated test_texttrackregion.html to reflect the changes as well.

See spec bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=24380
Backed out changeset 2b3efd1687ec for landing with the wrong bug number.
Bug 978163 - Part 4: Add test for VTTCue::Region. r=rillian

Updated test_texttrackregion.html to reflect the changes as well.

See spec bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=24380

DONTBUILD
Bug 970363 - Make PeekOffset* methods return continue reason. r=roc
Bug 970363 - Fix selection moving over readonly elements in contenteditble blocks. r=roc
Bug 982302 - Braces are missing in nsBaseURLParser::ParseURL. r=mcmanus
Bug 966564 - Make logging more clear when processing an unwrapped indication. r=drno
Bug 981132 - set up atfork on the main thread. r=bgirard

--HG--
extra : rebase_source : adbbf08a081dac84de6e1c2d001f32c786b38dc5
Bug 981126 - Prevent glxtest child process from executing the normal shutdown sequence. r=bgirard, r=jrmuizel

--HG--
extra : rebase_source : b28d660a9959895f743515f64381e4a5e0bb2c74
Bug 863658 - Replace mozilla-banner.gif with a plain blue image in 359903-2.html since we aren't trying to test individual pixel differences in resized image painting there, r=bz

--HG--
extra : rebase_source : 7195cabfd486dc4902319506349e2fc1d74b6f00
Bug 930903 - Remove obsolete bit of comment. r=me and DONTBUILD because NPOTB
Bug 938359 - [e10s] Support middle-click scroll (r=felipe)
Bug 982828 - [e10s] Disable mochitest-plain tests that don't pass in e10s (r=ted)
Backed out changeset d6261f65070a
Bug 977236: Use referrer for application reputation checks (r=gcp)
Bug 982359 - Increase timeout for browser_net_filter-03.js to avoid it failing on Ubuntu. r=me
Bug 982997 - Add some logging. r=jwalker