Make sure the experiment-derived value is used for VP9. Bug: webrtc:11024 Change-Id: I80b6d388486f2dec793bc8ca872babe6165dcfb2 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/156562 Commit-Queue: Elad Alon <eladalon@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29453}