This enum is no longer needed. Also moving the last piece of code from common.h to audio_processing_impl.h, allowing to delete common.h. Bug: chromium:1271981, b/217349489 Change-Id: If115336c36d6d7b5845a903e421c18aebfe434ee Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/251242 Reviewed-by: Sam Zackrisson <saza@webrtc.org> Commit-Queue: Henrik Lundin <henrik.lundin@webrtc.org> Cr-Commit-Position: refs/heads/main@{#35946}