We already default to PipeWire 0.3 and there is no reason to keep
continue supporting an old version of PipeWire which is not maintained
anymore, wont't get any update or new features. It also makes the code
easier to understand since we can remove all ifdefs we had to support
two versions simultaneously.
Bug: chromium:1146942
Change-Id: I7156e1784ebfad111485a2944199563568a75eec
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227345
Reviewed-by: Tommi <tommi@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34765}