This completes the removal of the legacy pacer. Bug: webrtc:10809 Change-Id: I8962ad56aa673f46b2c0e2cf8a5630e2c9942c92 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/262421 Reviewed-by: Per Kjellander <perkj@webrtc.org> Commit-Queue: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/main@{#36900}