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When backing down, the delay based estimator can still use acked bitrate instead of the last set estimate. Original code was reviewed in: https://webrtc-review.googlesource.com/c/src/+/113880 BUG=webrtc:10144 Change-Id: Ia6e2d6d7d05f88f7e51d61b6e37c61a89adccf8a Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/135950 Reviewed-by: Christoffer Rodbro <crodbro@webrtc.org> Commit-Queue: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27912}