Since locking model has been cleaned up, PacingController can now call
PacketRouter directly - without having to go via PacedSender or
TaskQueuePacedSender.
Bug: webrtc:10809
Change-Id: I181f04167d677c35395286f8b246aefb4c3e7ec7
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/175909
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31342}