[Sync] SyncEngine refactor part 1: interfaces.

components/sync/driver/model_type_controller.h

Index: components/sync/driver/model_type_controller.h
diff --git a/components/sync/driver/model_type_controller.h b/components/sync/driver/model_type_controller.h
index 6c830980df615b6728a31c530b884a53f23ee291..7efa58f7eb77b9063b4b8b3b17bb8c717fc0e129 100644
--- a/components/sync/driver/model_type_controller.h
+++ b/components/sync/driver/model_type_controller.h
@@ -40,10 +40,10 @@ class ModelTypeController : public DataTypeController {
   // Registers non-blocking data type with sync backend. In the process the
   // activation context is passed to ModelTypeRegistry, where ModelTypeWorker
   // gets created and connected with ModelTypeProcessor.
-  void RegisterWithBackend(BackendDataTypeConfigurer* configurer) override;
+  void RegisterWithBackend(ModelTypeConfigurer* configurer) override;
   void StartAssociating(const StartCallback& start_callback) override;
-  void ActivateDataType(BackendDataTypeConfigurer* configurer) override;
-  void DeactivateDataType(BackendDataTypeConfigurer* configurer) override;
+  void ActivateDataType(ModelTypeConfigurer* configurer) override;
+  void DeactivateDataType(ModelTypeConfigurer* configurer) override;
   void Stop() override;
   std::string name() const override;
   State state() const override;