The pacer status is never changed unless MaybeProcessPackets() is
called. This CL removes the scheduler, and updates pacer status after
every MaybeProcessPackets().
Bug: webrtc:10809, webrtc:13417
Change-Id: Ib5f18decf44c1596c0a716d799600a72b2332abd
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/239120
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35489}
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