[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 92152d7a95a558208a87074d8422c6c93d9269f3..9b6361c0fbfa67c52c5da2292e45a03b9fec6d55 100644
--- a/components/sync/driver/model_type_controller.h
+++ b/components/sync/driver/model_type_controller.h
@@ -38,6 +38,7 @@ class ModelTypeController : public DataTypeController {
   void LoadModels(const ModelLoadCallback& model_load_callback) override;
   void GetAllNodes(const AllNodesCallback& callback) override;
   void GetStatusCounters(const StatusCountersCallback& callback) override;
+  void BeforeLoadModels(ModelTypeConfigurer* configurer) override;

[maxbogue, 2017/01/19 19:19:54]

Maintain order with DTC; put this right above LoadModels, here and in the .cc
file.

[pavely, 2017/01/19 20:27:39]

Done.

   void RegisterWithBackend(base::Callback<void(bool)> set_downloaded,
                            ModelTypeConfigurer* configurer) override;
   void StartAssociating(const StartCallback& start_callback) override;