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Now that we're building with the official SDK these aren't needed
anymore.

Bug: 1105187, 1115294
Test: Bots are okay, manually confirmed VP9 hardware decoding on Big Sur.
Change-Id: I9d190989a23266a5615cb149b4a958ad46d39611
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545880
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828573}