Revert of [Android] Provide unhandled tap event notifications

Revert of [Android] Provide unhandled tap event notifications (https://codereview.chromium.org/218633008/)

Reason for revert:
TouchEditableImplAuraTest.TouchCursorInTextfieldTest failing in the waterfall on Linux ChromiumOS Tests (2) 
link: http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%282%29/builds/22962

Original issue's description:
> [Android] Reland "Provide unhandled tap event notifications"
> 
> Allow notifications of unhandled taps via the GestureStateListener.  This change
> makes GestureTap events blocking, but there are several use-cases for which this
> will be necessary, e.g., WebView and contextual search.
> 
> This was landed in r26143 and reverted in r261470 due to to a failure in
> TouchEditableImplAuraTest.TouchCursorInTextfieldTest.  The test has been fixed.
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=262497

TBR=mkosiba@chromium.org,donnd@chromium.org,tedchoc@chromium.org,tdresser@chromium.org,sky@chromium.org,jdduke@chromium.org
NOTREECHECKS=true
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=262517

[tapted, 2014-04-08 21:58:53]

Created Revert of [Android] Provide unhandled tap event notifications

[commit-bot: I haz the power, 2014-04-08 22:00:43]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tapted@chromium.org/229373002/1

[commit-bot: I haz the power, 2014-04-08 22:02:23]

Change committed as 262517