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This is just like r145992 but for a different call site. If the script
executing creates a popup, we want the user gesture flag to be set correctly to
allow user-initiated popups.

BUG=130178

Review URL: https://chromiumcodereview.appspot.com/10827210

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150468 0039d316-1c4b-4281-b951-d872f2087c98