Roll DEPS.xwalk: chromium_crosswalk_rev (abbaeb8 -> ea46c0b)

ea46c0b Merge pull request #215 from pozdnyakov/XWALK_2789
17ac09e Fix GPU process crash
Merge pull request #2675 from pozdnyakov/roll_deps

Roll DEPS.xwalk: chromium_crosswalk_rev (abbaeb8 -> ea46c0b)