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This reverts the proto changes from commit d70c086c.

Reason for revert: Server side code has a lot of dependencies that need to be cleaned up first.

Original change's description:
> Sync: Delete deprecated SUPERVISED_USERS and _SHARED_SETTINGS data types
>
> 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}

TBR=treib@chromium.org,mastiz@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 965503
Change-Id: If5d1ee616f2ca4daefe69fd1e0ad3a516d726675
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863789Reviewed-by: Tim Schumann <tschumann@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Tim Schumann <tschumann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706347}