Bug 874295. On non-Android platforms (and eventually for Android), use call GetDefaultScale instead of GetDevicePixelsPerMetaViewportPixel. r=mbrubeck

--HG--
extra : rebase_source : 9c0544baccfe277e9340d185f189eda174923eb4
Bug 872254. Clear line/row cursors when overflow areas of lines or table rows change. r=bz

--HG--
extra : rebase_source : 81c1c4269e22ffad98433669ef152002b9d63533
Bug 868405. Part 1: Add a few MOZ_OVERRIDES. r=jesup

--HG--
extra : rebase_source : 9fce360b62677439a353b2fb81d9bab92b659d13
Bug 868405. Support 'enabled' attribute on MediaStreamTrack. r=jesup

--HG--
extra : rebase_source : ec29ae2e45979baaf1b6a085549755ba86cadd40