Temporary rollback of r9384 (Change Activity to an abstract class) until some internal clients catch up

Original review at http://gwt-code-reviews.appspot.com/1200801


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9386 8db76d5a-ed1c-0410-87a9-c151d255dfc7
10 files changed