Remove unused member noise_var from RateControlInput struct. Rename incoming_bitrate to estimated_throughput_bps to reflect that the AimdRateControl may be running on either the send side or the receive side. Bug: webrtc:9411 Change-Id: Ie1ae0c29dc9559ef389993144e69fcd41684f1a4 Reviewed-on: https://webrtc-review.googlesource.com/83728 Reviewed-by: Stefan Holmer <stefan@webrtc.org> Reviewed-by: Anastasia Koloskova <koloskova@webrtc.org> Commit-Queue: Björn Terelius <terelius@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23783}