Makes disabled buttons appear differently in KitchenSink (to deal in particular
with the fact that Safari doesn't render disabled buttons differently by
default).
Patch by: bobv
Review by: jgw


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@1146 8db76d5a-ed1c-0410-87a9-c151d255dfc7