lgtm other than the style issue.
http://codereview.appspot.com/166046/diff/7/1007 File features/src/main/javascript/features/rpc/rpc.js (left): http://codereview.appspot.com/166046/diff/7/1007#oldcode297 features/src/main/javascript/features/rpc/rpc.js:297: Since this is an internal routine we might want to make this _getTargetWin http://codereview.appspot.com/166046
