Reason for revert: Revert because it breaks downstream code. Original issue's description: > Clean away use of RtpAudioFeedback interface from RTP/RTCP receiver code. > > BUG=webrtc:4690 > > Committed: https://crrev.com/69a81999ace08e40e2b2ec526b0e111aa11b9538 > Cr-Commit-Position: refs/heads/master@{#12015} TBR=henrik.lundin@webrtc.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=webrtc:4690 Review URL: https://codereview.webrtc.org/1812453002 Cr-Commit-Position: refs/heads/master@{#12016}