When I enable "Sync Everything", then the new datatype works.

https://chromium-review.googlesource.com/c/chromium/src/+/1124330

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/08c03bc5dc5c4be0d116bbc3aaa6d8a1b582b259

commit 08c03bc5dc5c4be0d116bbc3aaa6d8a1b582b259
Author: vitaliii <vitaliii@chromium.org>
Date: Wed Jul 04 12:29:45 2018

[Sync] Enable consents when sync is enabled.

Previously "Sync Everything" settings switch disabled user consents
datatype. In this CL, the datatype is always enabled (like device info).

Bug:  859825 
Change-Id: I345465be97d8b2d95c503130bb2e1274a96f48e1
Reviewed-on: https://chromium-review.googlesource.com/1124330
Commit-Queue: vitaliii <vitaliii@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572542}
[modify] https://crrev.com/08c03bc5dc5c4be0d116bbc3aaa6d8a1b582b259/components/sync/base/model_type.h
[modify] https://crrev.com/08c03bc5dc5c4be0d116bbc3aaa6d8a1b582b259/components/sync/base/sync_prefs.cc
[modify] https://crrev.com/08c03bc5dc5c4be0d116bbc3aaa6d8a1b582b259/components/sync/base/sync_prefs_unittest.cc

Checked on ToT (disabled all switches in sync settings).