Fix instance of javac's empty warning.

Review at http://gwt-code-reviews.appspot.com/1598803

Review by: skybrian@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10761 8db76d5a-ed1c-0410-87a9-c151d255dfc7
1 file changed