Fix !important css typo

Repost of 1585805.
Thanks Stephen!

Review at http://gwt-code-reviews.appspot.com/1725806

Review by: rdayal@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@11025 8db76d5a-ed1c-0410-87a9-c151d255dfc7
1 file changed