Clean up RtpVp9RefFinder unittests.
Bug: webrtc:12221 Change-Id: I2ad77475bd62775452c7b81ba7ad193bea66cc8f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/196527 Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Commit-Queue: Philip Eliasson <philipel@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32794}
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