Preparation for deleting PeerConnectionInterface::StartRtcEventLog method with a PlatformFile argument. Bug: webrtc:6463 Change-Id: Ia9fa1d99a3d87f3bf193e73382690b782ffea65c Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/135285 Commit-Queue: Niels Moller <nisse@webrtc.org> Reviewed-by: Björn Terelius <terelius@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27879}