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In [1], treib@ suggested moving this to settings pref instead of
including it within sync prefs.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/1977956

Change-Id: Ide9c1c4e8b1ede12e3324db96db44293bc8ec703
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2008302
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734273}