Fix incorrect active key if moved out of keyboard area

BUG=304305
R=kevers@chromium.org

Review URL: https://codereview.chromium.org/26035003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227299 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227299