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It needs a base::TaskScheduler.

Change-Id: I20f1f92a62c6c5e63990d6d1bb67b7ca063317ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539921
Commit-Queue: Paul Jensen <pauljensen@chromium.org>
Auto-Submit: Paul Jensen <pauljensen@chromium.org>
Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644420}