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This CL removes the VP9.2 video decoding workaround after some other
CLs paved the way for it (see bug). Verified on my local Zork.

Bug: b/1695991197
Change-Id: Ie1f5343ad3f181103d550e5061cfd54ea2477fd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2644290
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Auto-Submit: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845974}