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

components/sync/engine/fake_sync_engine.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_SYNC_ENGINE_FAKE_SYNC_ENGINE_H_
 #define COMPONENTS_SYNC_ENGINE_FAKE_SYNC_ENGINE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 14 matching lines @@
  public:
   FakeSyncEngine();
   ~FakeSyncEngine() override;
 
   void Initialize(InitParams params) override;
 
   void TriggerRefresh(const ModelTypeSet& types) override;
 
   void UpdateCredentials(const SyncCredentials& credentials) override;
 
-  void StartConfiguration() override;
-
   void StartSyncingWithServer() override;
 
   void SetEncryptionPassphrase(const std::string& passphrase,
                                bool is_explicit) override;
 
   bool SetDecryptionPassphrase(const std::string& passphrase) override;
 
   void StopSyncingForShutdown() override;
 
   void Shutdown(ShutdownReason reason) override;
 
   void ConfigureDataTypes(ConfigureParams params) override;
 
-  void RegisterDirectoryDataType(ModelType type, ModelSafeGroup group) override;
-
-  void UnregisterDirectoryDataType(ModelType type) override;
-
   void EnableEncryptEverything() override;
 
   void ActivateDirectoryDataType(ModelType type,
                                  ModelSafeGroup group,
                                  ChangeProcessor* change_processor) override;
   void DeactivateDirectoryDataType(ModelType type) override;
 
   void ActivateNonBlockingDataType(ModelType type,
                                    std::unique_ptr<ActivationContext>) override;
   void DeactivateNonBlockingDataType(ModelType type) override;
@@ skipping 31 matching lines @@
 
   void set_fail_initial_download(bool should_fail);
 
  private:
   bool fail_initial_download_;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_FAKE_SYNC_ENGINE_H_