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I've added 'internal_only' and 'platform_only' features to our policies
in this CL.  This will fix a problem the admin console team is hitting
where our policies are showing up in the console but aren't configurable
via cloud policy (or aren't applicable outside of Google).

While I was making changes, I also fixed some references to other
policy names which were missing the '<ph...' tags.

Change-Id: Iac11f832b6e17cee0005eb74989a4818ce3f9b9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495709Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Joe Downing <joedow@google.com>
Cr-Commit-Position: refs/heads/master@{#820876}