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The concept of registered datatypes is somewhat advanced and should not
be part of SyncService's public API.

Instead, this patch moves it to the subclass, ProfileSyncService, and
makes it private except for testing.

Change-Id: I0934a6a97009bf6589f1075ba37fdc1a52490643
Bug: 915154
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463832Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816511}