Check for appropriate bindings in process-per-site mode.

BUG=174059
TEST=See bug for repro steps.


Review URL: https://chromiumcodereview.appspot.com/12188025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@181386 0039d316-1c4b-4281-b951-d872f2087c98