Remove CompilationUnit.getSource().

No longer needed with GwtAstBuidler.

http://gwt-code-reviews.appspot.com/1462807/
Review by: zundel@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10493 8db76d5a-ed1c-0410-87a9-c151d255dfc7
9 files changed