Since a dynamically created page does not have any NavigationEntry, TabContents has a title for that case.

      BUG=5988
TEST=
Open this attachment file, and observe it.
http://code.google.com/p/chromium/issues/attachmentText?id=5988&aid=3251842682813580997&name=test_popup.html&token=345d0d5d6f201d69c6b4ba649e5b14aa

Review URL: http://codereview.chromium.org/6883078

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86818 0039d316-1c4b-4281-b951-d872f2087c98