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The script to push a new policy has moved to components, but we didn't
update the documentation.

Change-Id: I34bc6259c88db541056b098b587d7cfab9e0e8ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469460
Auto-Submit: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818008}