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tabs, particularly extension bg pages, infobars, and popups. This is
needed to enable WebDriver to work with these views.
BUG=93571
TEST=none


Review URL: http://codereview.chromium.org/8790003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113023 0039d316-1c4b-4281-b951-d872f2087c98