[Sync] Refactor AttachmentStore classes. Introduce concept of referrer.

chrome/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 CHROME_BROWSER_SYNC_PROFILE_SYNC_COMPONENTS_FACTORY_IMPL_H__
 #define CHROME_BROWSER_SYNC_PROFILE_SYNC_COMPONENTS_FACTORY_IMPL_H__
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 48 matching lines @@
       invalidation::InvalidationService* invalidator,
       const base::WeakPtr<sync_driver::SyncPrefs>& sync_prefs,
       const base::FilePath& sync_folder) override;
 
   scoped_ptr<sync_driver::LocalDeviceInfoProvider>
   CreateLocalDeviceInfoProvider() override;
 
   base::WeakPtr<syncer::SyncableService> GetSyncableServiceForType(
       syncer::ModelType type) override;
   scoped_ptr<syncer::AttachmentService> CreateAttachmentService(
-      const scoped_refptr<syncer::AttachmentStore>& attachment_store,
+      scoped_ptr<syncer::AttachmentStore> attachment_store,
       const syncer::UserShare& user_share,
       const std::string& store_birthday,
       syncer::ModelType model_type,
       syncer::AttachmentService::Delegate* delegate) override;
 
   // Legacy datatypes that need to be converted to the SyncableService API.
   SyncComponents CreateBookmarkSyncComponents(
       ProfileSyncService* profile_sync_service,
       sync_driver::DataTypeErrorHandler* error_handler) override;
   SyncComponents CreateTypedUrlSyncComponents(
@@ skipping 29 matching lines @@
   const GURL sync_service_url_;
   OAuth2TokenService* const token_service_;
   net::URLRequestContextGetter* const url_request_context_getter_;
 
   base::WeakPtrFactory<ProfileSyncComponentsFactoryImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncComponentsFactoryImpl);
 };
 
 #endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_COMPONENTS_FACTORY_IMPL_H__