history no longer used for storing unsent packets and for legacy pacer. Bug: None Change-Id: I639c37de66857a64c620e80df6288fa6ce8326d4 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/253260 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/main@{#36120}