Increase heap size used for building javadoc.

Without this change, an OutOfMemoryError exception is thrown during
clean builds.

Review by: spoon@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@8334 8db76d5a-ed1c-0410-87a9-c151d255dfc7
1 file changed