Since the degradation preference can be fetch from the thread safe provider, this removed the need to have 2 queues. Bug: None Change-Id: I94cb8b7d3d2950acfe0ad0a6d46edc038ed8e286 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/177523 Commit-Queue: Evan Shrubsole <eshr@google.com> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31898}