The submit method should have ForIsolatedWorlds directive
rather than SetterForIsolatedWorlds as it is a method not
a property.

Review URL: https://codereview.chromium.org/160893002

git-svn-id: svn://svn.chromium.org/blink/trunk@167111 bbb929c8-8fbe-4397-9dbb-9b2b20218538