[Sync] Convert DTCs to be not RefCounted and NonThreadSafe.

components/sync/driver/fake_sync_service.h

Index: components/sync/driver/fake_sync_service.h
diff --git a/components/sync/driver/fake_sync_service.h b/components/sync/driver/fake_sync_service.h
index b91b8b4e66dd363facee241e2e8c8d1464630c95..4bc27102acd13b7e306b46d1f202318832d1002c 100644
--- a/components/sync/driver/fake_sync_service.h
+++ b/components/sync/driver/fake_sync_service.h
@@ -5,6 +5,7 @@
 #ifndef COMPONENTS_SYNC_DRIVER_FAKE_SYNC_SERVICE_H_
 #define COMPONENTS_SYNC_DRIVER_FAKE_SYNC_SERVICE_H_
 
+#include <memory>
 #include <string>
 
 #include "components/sync/driver/sync_service.h"
@@ -66,7 +67,8 @@ class FakeSyncService : public sync_driver::SyncService {
   syncer::UserShare* GetUserShare() const override;
   LocalDeviceInfoProvider* GetLocalDeviceInfoProvider() const override;
   void RegisterDataTypeController(
-      sync_driver::DataTypeController* data_type_controller) override;
+      std::unique_ptr<sync_driver::DataTypeController> data_type_controller)
+      override;
   void ReenableDatatype(syncer::ModelType type) override;
   SyncTokenStatus GetSyncTokenStatus() const override;
   std::string QuerySyncStatusSummaryString() override;