Build fix; makes a PopupPanel "remember" what size the user asked for.  This allows a user to set a size first and then add a child widget (which historically works).  Also changes expected/actual in PopupTest.

Review by: jgw (desk check)


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@1155 8db76d5a-ed1c-0410-87a9-c151d255dfc7