Skip accelerator handling if there is a grabbed widget.
Skip accelerator handling if there is a grabbed widget.

Grabbed widget in gtk should get all the mouse and keyboard events and we
should respect that.

BUG=<http://crosbug.com/2355>
TEST=Verify 2nd issue of 2355 that combobox dropdown should not disappear after mouse release. Also verify that 1st ESC should clear off combo's dropdown and 2nd ESC should dismiss the dialog. Please also pay attention to other regressions related to accelerator keys on gtk (linux, linux_chromeos builds).

Review URL: http://codereview.chromium.org/1727020

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@46229 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser