Fix Mac build warning (very rightful)
Fix Mac build warning (very rightful)

Review URL: https://chromiumcodereview.appspot.com/10702201

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@12077 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

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