Change a cast to make MacOS compiler happy.
Change a cast to make MacOS compiler happy.

We need to find a nicer way to handle these.

TBR=whesse@chromium.org
Review URL: http://codereview.chromium.org/182043

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@2800 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh