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The feature has been enabled by default since
https://crrev.com/c/2090451 which landed in M83. The feature has been
enabled at 100% in Chrome via the field trials infrastructure since
March. At this point, it's fair to expect the feature is here to stay.

This CL cleans up the feature flag. No behavior change is expected.

Change-Id: Ie30a758f453c3a9d9fd96d43ae53d9c3893e0bb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2244654
Commit-Queue: Jarryd Goodman <jarrydg@chromium.org>
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: Jarryd Goodman <jarrydg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#778984}