GitLab

(The interstitial is displayed on top of an existing page. We don't want the hidden page to interfere with the interstitial.)

BUG=http://crbug.com/3256
TEST=Open the page attached in the bug (interstitial_test.html), no alert boxes should show.
Review URL: http://codereview.chromium.org/149261

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20084 0039d316-1c4b-4281-b951-d872f2087c98