Fixes Issue #1768.
Safari adds whitespace around our common pattern for hidden iframes.
This changes them to be position:absolute which ensures they don't
consume space in the flow.

Patch by: jlabanca
Review by: knorton, fredsa



git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@1534 8db76d5a-ed1c-0410-87a9-c151d255dfc7