Revert of [Sync] Make directory types registration explicit in ModelTypeRegistry

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 90925265ca0fa072b744c97b51c1d2ddb5b54799..92152d7a95a558208a87074d8422c6c93d9269f3 100644
--- a/components/sync/driver/model_type_controller.h
+++ b/components/sync/driver/model_type_controller.h
@@ -35,8 +35,9 @@
 
   // DataTypeController implementation.
   bool ShouldLoadModelBeforeConfigure() const override;
-  void BeforeLoadModels(ModelTypeConfigurer* configurer) override;
   void LoadModels(const ModelLoadCallback& model_load_callback) override;
+  void GetAllNodes(const AllNodesCallback& callback) override;
+  void GetStatusCounters(const StatusCountersCallback& callback) override;
   void RegisterWithBackend(base::Callback<void(bool)> set_downloaded,
                            ModelTypeConfigurer* configurer) override;
   void StartAssociating(const StartCallback& start_callback) override;
@@ -45,8 +46,6 @@
   void Stop() override;
   std::string name() const override;
   State state() const override;
-  void GetAllNodes(const AllNodesCallback& callback) override;
-  void GetStatusCounters(const StatusCountersCallback& callback) override;
 
  private:
   void RecordStartFailure(ConfigureResult result) const;