Removed all unused or transitional parts Bug: webrtc:9838 Change-Id: I6bc14e4e0ac09ab27e4d739ac76bb6a4dfff2cb7 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/260140 Commit-Queue: Florent Castelli <orphis@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/main@{#36741}