The value is being moved:
https://github.com/w3c/webrtc-stats/pull/167
Stop collecting this value. Our previous value was incorrect, our RTT
value was a smoothed value based on STUN pings but the spec says it
should be based on RTCP timestamps in RTCP Receiver Report (RR) on
inbound streams with isRemote=true (not supported).
Updated some bug references.
BUG=webrtc:7065, webrtc:7066
Review-Url: https://codereview.webrtc.org/2722633005
Cr-Commit-Position: refs/heads/master@{#16931}