More suppressions, uninitialized read in cricket::VideoFrame::Validate

BUG=3789
R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/27409004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7116 4adac7df-926f-26a2-2b94-8c16560cd09d