Replace flooding logs in rtp_sender.cc with a comment.

Started occurring after:
https://webrtc-codereview.appspot.com/11129004

BUG=3153
R=andresp@webrtc.org, mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/11439004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5916 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed