Makes SuggestBox implement HasEnabled, fixing GWT issue 6530 Review by rjrjr: http://gwt-code-reviews.appspot.com/1567803/ Review by: skybrian@google.com git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10703 8db76d5a-ed1c-0410-87a9-c151d255dfc7