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This CL introduces a feature that when enabled causes ChromeSync not to
respect the state of the master sync toggle on Android [1]. Users who
previously had ChromeSync disabled just because of this toggle will be
migrated into a state with sync enabled.

[1] https://screenshot.googleplex.com/4BWPEDJ28F0

TBR=treib@chromium.org

Bug: 1105795
Change-Id: I3e93b1f7eba1f1188138eb805818552157af2456
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2299353
Commit-Queue: Victor Vianna <victorvianna@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789515}