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The new ShouldSyncStart includes the "FirstSetupComplete" check. With
this, StartupController doesn't have any knowledge of Sync setup state
anymore.
As a nice side effect, this allows us to remove SyncPrefs from
StartupController.

Bug: 854978
Change-Id: Ia9fb178cf5a81ada4288f4c33bcc48ced4f631f4
Reviewed-on: https://chromium-review.googlesource.com/1112241
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570008}