Re-rolling "Re-implement runAsync to improve code size." Take 3. http://gwt-code-reviews.appspot.com/1442807/ Review by: zundel@google.com git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10270 8db76d5a-ed1c-0410-87a9-c151d255dfc7