Fix autofill popups not closing when there are no suggestions. We have to call...

Fix autofill popups not closing when there are no suggestions. We have to call through on an empty suggestion array so that the popup is told to close.

BUG=http://crbug.com/25559
TEST=as in bug

Review URL: http://codereview.chromium.org/353009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@30821 0039d316-1c4b-4281-b951-d872f2087c98