End goal is to remove PeerConnectionE2EQualityTestFixture::PeerConfigurer interface. Change-Id: I4a6aa0ab1fb5a0d6f85154159b7da16de9b53059 Bug: webrtc:14627 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/281501 Reviewed-by: Artem Titov <titovartem@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Jeremy Leconte <jleconte@google.com> Cr-Commit-Position: refs/heads/main@{#38551}