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These histograms were declared manually for all data types. As a result,
many of them (for newer data types) were missing. This CL uses histogram
suffixes instead.

This CL also puts the related suffix SyncModelType up-to-date.

Bug: 883252
Change-Id: Ia594f068919bee4ed233b7c1477460a7f04ab797
Reviewed-on: https://chromium-review.googlesource.com/1245117Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594613}