Revert 55232 - Dispatch key event to bindings processing.
Revert 55232 - Dispatch key event to bindings processing.

This properly activates the default widget on a GtkWindow.

BUG=chromium-os:4005
TEST=Default button of hosted native dialogs in ChromeOS should work.

Review URL: http://codereview.chromium.org/3087011

TBR=xiyuan@chromium.org
Review URL: http://codereview.chromium.org/3038053

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@55284 0039d316-1c4b-4281-b951-d872f2087c98

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