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These two types are deprecated and can be removed. Note that
SUPERVISER_USER_SETTINGS and SUPERVISED_USER_WHITELISTS are *not*
deprecated.

This includes removing the ModelType enum entries, removing the fields
in the EntitySpecifics proto, and deleting the specifics proto files.

Bug: 965503
Change-Id: I53038fdc28ed8518cd99d4a4769b5f1f52d3e94b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824882
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700687}