The renaming is to reflect this class is only used for RTCP interaction and not for other transports. This Cl will be followed by multiple CLs moving all send-side RTP functionality to a separate class, rtp module ownership away from VideoSendStream and use TaskQueue instead of ProcessThread for RTP. BUG=webrtc:6456 Review-Url: https://codereview.webrtc.org/2390463002 Cr-Commit-Position: refs/heads/master@{#14556}