BUG=309
TESTED=try bots still pass
R=braveyao@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/7709004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@976 16f28f9a-4ce2-e073-06de-1de4eb20be90