P2PTransportChannel can then use either of the ICE controller factories configured with field trials.
Bug: webrtc:14367, webrtc:14131
Change-Id: I09ab99673d6ef81f56abe88987f5b67d84c24cb5
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/271292
Reviewed-by: Jonas Oreland <jonaso@webrtc.org>
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Commit-Queue: Sameer Vijaykar <samvi@google.com>
Cr-Commit-Position: refs/heads/main@{#38076}
