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These ancient sync types haven't been used for years and deprecated in
2014 with https://codereview.chromium.org/780363003.

We now rename the enum to prevent accidental references, and remove
some code leftovers that were effectively dead (e.g. type expansion
in SyncPrefs).

While doing this, we unify some strings in model_type.cc to avoid
prefix "Deprecated" in type names, which some types did, and instead
the presubmit checks are updated to whitelist deprecated datatypes and
allow their strings to be inconsistent.

Bug: 923826
Change-Id: Ib1d7b90042ef4598cc80d036cc50c3494eb170a6
Reviewed-on: https://chromium-review.googlesource.com/c/1454520
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629158}