Migrate remaining usages inside webrtc (all are test only) to CreateVp8Decoder Bug: webrtc:15791 Change-Id: I6a8317a8761953208ba746ac785fa1606217e6f5 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/340300 Commit-Queue: Erik Språng <sprang@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Auto-Submit: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/main@{#41792}