Move source of truth for IsSyncRequested to SyncUserSettings

Bug: 884159
Change-Id: Ib7e45514652a2bd529d116b10138037e8f11d72c
Reviewed-on: https://chromium-review.googlesource.com/c/1409197
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622766}
2 files changed