This CL is preparation for extraction of public API for network
emulation layer.
Bug: webrtc:10138
Change-Id: Id59204ea20a103dafce4122c59e51a354836c374
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/126624
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27050}