Reason for revert: Speculative revert. Intermittent memory access errors suspected to be caused by this cl. See for instance https://build.chromium.org/p/client.webrtc/builders/Win%20DrMemory%20Light/builds/8018 UNADDRESSABLE ACCESS of freed memory: reading 0x0331d330-0x0331d334 4 byte(s) # 0 webrtc::voe::RtcpRttStatsProxy::LastProcessedRtt # 1 webrtc::ModuleRtpRtcpImpl::Process Original issue's description: > Add RtcpRttStats to AudioStream > > BUG=webrtc:6508 > > Committed: https://crrev.com/e0729c56d35acfaf9738fdb32c6508cd78eaf089 > Cr-Commit-Position: refs/heads/master@{#14595} TBR=stefan@webrtc.org,minyue@webrtc.org,solenberg@webrtc.org,michaelt@webrtc.org # Not skipping CQ checks because original CL landed more than 1 days ago. BUG=webrtc:6508 Review-Url: https://codereview.webrtc.org/2415943002 Cr-Commit-Position: refs/heads/master@{#14631}