Uber: Don't attempt to set the title of a page that has not been loaded yet.

BUG=none
TEST=none
R=dbeam

Review URL: https://chromiumcodereview.appspot.com/9373045

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@121347 0039d316-1c4b-4281-b951-d872f2087c98