[Sync] SyncEngine refactor part 1: interfaces.

components/browser_sync/profile_sync_components_factory_impl.h

 // Copyright (c) 2012 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_BROWSER_SYNC_PROFILE_SYNC_COMPONENTS_FACTORY_IMPL_H__
 #define COMPONENTS_BROWSER_SYNC_PROFILE_SYNC_COMPONENTS_FACTORY_IMPL_H__
 
 #include <memory>
 #include <string>
 
@@ skipping 51 matching lines @@
 
   // SyncApiComponentFactory implementation:
   void RegisterDataTypes(
       syncer::SyncService* sync_service,
       const RegisterDataTypesMethod& register_platform_types_method) override;
   syncer::DataTypeManager* CreateDataTypeManager(
       const syncer::WeakHandle<syncer::DataTypeDebugInfoListener>&
           debug_info_listener,
       const syncer::DataTypeController::TypeMap* controllers,
       const syncer::DataTypeEncryptionHandler* encryption_handler,
-      syncer::SyncBackendHost* backend,
+      syncer::SyncEngine* engine,
       syncer::DataTypeManagerObserver* observer) override;
-  syncer::SyncBackendHost* CreateSyncBackendHost(
+  syncer::SyncEngine* CreateSyncEngine(
       const std::string& name,
       invalidation::InvalidationService* invalidator,
       const base::WeakPtr<syncer::SyncPrefs>& sync_prefs,
       const base::FilePath& sync_folder) override;
   std::unique_ptr<syncer::LocalDeviceInfoProvider>
   CreateLocalDeviceInfoProvider() override;
   std::unique_ptr<syncer::AttachmentService> CreateAttachmentService(
       std::unique_ptr<syncer::AttachmentStoreForSync> attachment_store,
       const syncer::UserShare& user_share,
       const std::string& store_birthday,
@@ skipping 38 matching lines @@
 
   // Whether to override PREFERENCES to use USS.
   static bool override_prefs_controller_to_uss_for_test_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncComponentsFactoryImpl);
 };
 
 }  // namespace browser_sync
 
 #endif  // COMPONENTS_BROWSER_SYNC_PROFILE_SYNC_COMPONENTS_FACTORY_IMPL_H__