Removed all the Request sub-types. Fixed the generator and the server code where we were relying on the sub-types.

Patch by: amitmanjhi
Review by: rjrjr
Review at http://gwt-code-reviews.appspot.com/926801


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@8888 8db76d5a-ed1c-0410-87a9-c151d255dfc7
19 files changed