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This CL stops toggling "sync everything" from overriding all individual
prefs' on-disk value with "true" (see reasoning in bug report).

Bug: 815018
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: If6287376009b200355426113618933af9ad78243
Reviewed-on: https://chromium-review.googlesource.com/935836Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542929}