This prevents us from prematurely overwriting the packets in the history if the RTT is underestimated. Bug: webrtc:8766 Change-Id: I042e8ce74cdce2a0451596f4217779fc856b51f4 Reviewed-on: https://webrtc-review.googlesource.com/42960 Commit-Queue: Erik Språng <sprang@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21735}