Removing some TODO's from libyuv

BUG=1996
R=henrik.lundin@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2146004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4668 4adac7df-926f-26a2-2b94-8c16560cd09d
5 files changed