Updates the list of aggressive optimizations to be those
added within the last year.

Review at http://gwt-code-reviews.appspot.com/406801

Review by: scottb@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@7978 8db76d5a-ed1c-0410-87a9-c151d255dfc7