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This was added for Pixel 4 rollout, to have a kill switch in case
rendering at higher rates has any issues. The flag is not necessary
anymore.

R=boliu@chromium.org

Change-Id: I4dc804fee6ab162cd7dd0f5186c7f7faef41ed3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622520
Commit-Queue: Khushal <khushalsagar@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Auto-Submit: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842278}