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Clean up the pref associated with this field trial, with deletion
slated after several milestones.
More details at http://doc/1rYBoi6Hm270SB1njw3BhM3Qo9puZn3iiINQy-gMaz4I

Bug: 988028
Change-Id: I5846351c4d66b0cf04b4f5c92b7de88db5d4e18d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1689496
Commit-Queue: Ramya Nagarajan <ramyan@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681374}