Moved calculation of round trip time from transport feedback adapter to send side congestion
controller. This reduces the role of the transport specific transport feedback adapter and
gives more power to the congestion controller to decide how the feedback rtt should be
calculated and used.
Bug: webrtc:8415
Change-Id: I7878d9fb32c3f4ed11993a6f39e6d9c69fab190a
Reviewed-on: https://webrtc-review.googlesource.com/27980
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20973}
8c319e951a