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This addition is necessary to allow users to disable the feature once
the experiment is enabled.

Bug: 1099917
Change-Id: I4e537a1fe92d1329c75ff8c190f92ce7f1cde8b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2336020Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794867}