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This is a speculative patch for a bug causing a crash in
AutofillWalletSyncableService. This CL stops the generic change
processor from talking to the syncable service when the service gets
stopped.

GenericChangeProcessor only talks to the service because it gets pinged
by SyncBackendRegistrar. The registrar should not talk to the
GenericChangeProcessor after a data type gets deactivated. Normally, a
data type should get deactivated before it gets stopped. However, we
see crashes in Canary that seem to contradict this expected behavior.

Bug: 880029
Change-Id: I64b9ea1c3521a347983a530bc16c1f8e266769b6
Reviewed-on: https://chromium-review.googlesource.com/1230714
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592485}