Removing a stray junit dep missed in r9870.

Continuing the old code review thread:
http://gwt-code-reviews.appspot.com/1383804

Review by: scottb@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9902 8db76d5a-ed1c-0410-87a9-c151d255dfc7