Revert of Unified Gesture Recognizer

Revert of Unified Gesture Recognizer (https://codereview.chromium.org/251543003/)

Reason for revert:
GestureRecognizerTest is leaking memory.

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

[Lei Zhang, 2014-05-10 02:00:10]

Created Revert of Unified Gesture Recognizer

[Lei Zhang, 2014-05-10 02:01:12]

See: http://goo.gl/GoMZeq

[commit-bot: I haz the power, 2014-05-10 02:03:03]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/thestig@chromium.org/278073004/1

[commit-bot: I haz the power, 2014-05-10 02:03:04]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-05-10 02:03:05]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.