Implement EntryMethodHolder.init in source.

Stub out EntryMethodHolder.init() so we can use the existing empty method instead of having to create it from whole cloth.

http://gwt-code-reviews.appspot.com/1421803/


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10039 8db76d5a-ed1c-0410-87a9-c151d255dfc7