Remove const for plain data types in common_video/

BUG=1644
R=holmer@google.com, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1464004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4028 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed