[Sync] Make directory types registration explicit in ModelTypeRegistry

components/sync/engine/fake_model_type_connector.h

Index: components/sync/engine/fake_model_type_connector.h
diff --git a/components/sync/engine/fake_model_type_connector.h b/components/sync/engine/fake_model_type_connector.h
index 7c47378dc51cc894d2b022655773652013a9967e..978e24aa0eb8638920501391375bfa3704deb327 100644
--- a/components/sync/engine/fake_model_type_connector.h
+++ b/components/sync/engine/fake_model_type_connector.h
@@ -17,10 +17,12 @@ class FakeModelTypeConnector : public ModelTypeConnector {
   FakeModelTypeConnector();
   ~FakeModelTypeConnector() override;
 
-  void ConnectType(
+  void ConnectNonBlockingType(
       ModelType type,
       std::unique_ptr<ActivationContext> activation_context) override;
-  void DisconnectType(ModelType type) override;
+  void DisconnectNonBlockingType(ModelType type) override;
+  void RegisterDirectoryType(ModelType type, ModelSafeGroup group) override;
+  void UnregisterDirectoryType(ModelType type) override;
 };
 
 }  // namespace syncer