Reverting 30766. It caused failures in ui_tests...

Reverting 30766. It caused failures in ui_tests BrowserTest.SingleBeforeUnloadAfterWindowClose and apparently made the browser_tests crash.

BUG=26398
TEST=covered by ui_tests and browser_tests

Review URL: http://codereview.chromium.org/354015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@30775 0039d316-1c4b-4281-b951-d872f2087c98