Switch from using FakeNetworkPipe::SetConfig on holding direct reference
on instances of NetworkSimulationInterface if you are required to
reconfigure it in the runtime.
Also add fake_network_unittests to built test targets.
Bug: webrtc:9630
Change-Id: I5fd6b33904367aa6dc00ca2e2f5f780f433acf35
Reviewed-on: https://webrtc-review.googlesource.com/94510
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24314}
e23b8a9899