Only use the network thread for sending and receiving packets.
The one and only network thread is used as a worker thread in all
PeerConnections. Pacing when sending packets is done on the worker thread.
Bug: webrtc:14502
Change-Id: Ib373315688ae4d810ae1e4421101a859fca93b31
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/278621
Reviewed-by: Evan Shrubsole <eshr@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38354}
78d80f9be7