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Before this CL, sign-out would clear the pref representing whether Sync
should be decoupled from the Android master sync toggle. This CL
removes the clean-up logic and also makes sure that the pref is set
whenever ProfileSyncService detects there's no syncing account (either
on browser startup, or after sign-out). Indeed, by the time the
DecoupleSyncFromAndroidMasterSync feature is enabled, only users who
were already syncing but had the master toggle disabled should remain
in the coupled state.

Bug: 1105795
Change-Id: If5e36080159150fe976885b469696103df890ed4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2539202
Commit-Queue: Victor Vianna <victorvianna@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827887}