GitLab

Reason for revert:
Memory leak detected: http://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/builds/1239/steps/aura_unittests/logs/stdio

Original issue's description:
> Unified Gesture Recognizer
>
> This adds the unified GR for Aura behind the --use-unified-gesture-detector flag.
>
> BUG=332418
> TEST=GestureRecognizer/GestureRecognizerTest.*
>   MotionEventUITest.*
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=269325

Review URL: https://codereview.chromium.org/278183002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269628 0039d316-1c4b-4281-b951-d872f2087c98