This CL removes the old WebRTC-FakeNetwork(Send|Receive)[Param] field
trials. Instead, use the paremterized WebRTC-FakeNetworkSendConfig and
WebRTC-FakeNetworkSendConfig.
As an example, instead of WebRTC-FakeNetworkSendLossPercent/5/ you can
use WebRTC-FakeNetworkSendConfig/loss_percent:5/
Bug: webrtc:14238
Change-Id: Ib0021c5425e59688a5043a6285d9baccf2234a3d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/269405
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Auto-Submit: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37623}
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