Disables the popup scrollbar hack for FF3 and later on Mac OS X, where it is no
longer necessary.
Patch by: jgw
Review by: jlabanca (Desk check)


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@4867 8db76d5a-ed1c-0410-87a9-c151d255dfc7