Applies IWYU to pc/peer_connection.cc as test. Bug: webrtc:13532 Change-Id: Iec453fdf6525c6376cb73dd1199326a8e1a21ff6 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/249986 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/main@{#35845}