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This reverts commit df3250dd.

Reason for revert: Suspected of causing crashes, see crbug.com/1047879

Original change's description:
> Sync cleanup: Remove DEPRECATED_EXPERIMENTS ModelType
> 
> It has been deprecated and unused for a while.
> The specifics proto itself can't be removed yet because it's still used
> on the server.
> 
> Bug: 1009361
> Change-Id: Ic183a6e244435cfce60ccdda34bff3e22a032ff3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2022670
> Commit-Queue: Marc Treib <treib@chromium.org>
> Reviewed-by: Jan Krcal <jkrcal@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#736397}

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

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

Bug: 1009361, 1047879
Change-Id: I762fbf6f1b4b752a47b34e6a101a066d0c78aebc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036005Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738205}