05ce4ae31f
This is a reland of https://codereview.webrtc.org/2061423003/ Which was reverted in https://codereview.webrtc.org/2131913003/ The reason for the revert was that some upstream code used RtpSender::SetTargetBitrate(). I've added that back as a no-op until we it's been brought up to date. TBR=tommi@webrtc.org Review URL: https://codereview.webrtc.org/2131313002 . Cr-Commit-Position: refs/heads/master@{#13418}