Fix windows warning.
Fix windows warning.

TBR=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/583123003

git-svn-id: f98b9d40cb02301bc76fa9e1b46ee668158567fd@24076 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

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