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This is intended to replace the DeviceUserWhitelist policy.
The old policy will still be used in the absence of the new one for at
least a few releases of Chrome.

BUG=chromium:1103816

Change-Id: Ie4cb3376ffb92c41bb7036f23e4ee9cb182c39b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339500Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Brian Malcolm <bmalcolm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795267}