[Sync] Make directory types registration explicit in ModelTypeRegistry

components/sync/engine/fake_sync_engine.h

Index: components/sync/engine/fake_sync_engine.h
diff --git a/components/sync/engine/fake_sync_engine.h b/components/sync/engine/fake_sync_engine.h
index 70f3627d3ab069e79bd477d7f915455cb5de3ffe..b71bec98c96201aed7812c68f87efab60a26fea6 100644
--- a/components/sync/engine/fake_sync_engine.h
+++ b/components/sync/engine/fake_sync_engine.h
@@ -32,6 +32,8 @@ class FakeSyncEngine : public SyncEngine {
 
   void UpdateCredentials(const SyncCredentials& credentials) override;
 
+  void StartConfiguration() override;
+
   void StartSyncingWithServer() override;
 
   void SetEncryptionPassphrase(const std::string& passphrase,
@@ -45,6 +47,10 @@ class FakeSyncEngine : public SyncEngine {
 
   void ConfigureDataTypes(ConfigureParams params) override;
 
+  void RegisterDirectoryDataType(ModelType type, ModelSafeGroup group) override;
+
+  void UnregisterDirectoryDataType(ModelType type) override;
+
   void EnableEncryptEverything() override;
 
   void ActivateDirectoryDataType(ModelType type,