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These histograms that record datause of sync service by sync message
types. This level of detail is not needed. Overall datause of sync
service is tracked by DataUse.MessageSize.AllServices.* histograms.

Bug: 691866
Change-Id: Iddd456c1d3d3d550111b6f9c5fe78aa21306749a
Reviewed-on: https://chromium-review.googlesource.com/742702Reviewed-by: Stanislav Chiknavaryan <stanisc@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: rajendrant <rajendrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512971}