[Sync] Introduce AttachmentStoreForSync class

components/sync_driver/generic_change_processor.cc

 // Copyright 2014 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.
 
 #include "components/sync_driver/generic_change_processor.h"
 
 #include "base/location.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/sync_driver/sync_api_component_factory.h"
@@ skipping 76 matching lines @@
 
 }  // namespace
 
 GenericChangeProcessor::GenericChangeProcessor(
     syncer::ModelType type,
     DataTypeErrorHandler* error_handler,
     const base::WeakPtr<syncer::SyncableService>& local_service,
     const base::WeakPtr<syncer::SyncMergeResult>& merge_result,
     syncer::UserShare* user_share,
     SyncApiComponentFactory* sync_factory,
-    scoped_ptr<syncer::AttachmentStore> attachment_store)
+    scoped_ptr<syncer::AttachmentStoreForSync> attachment_store)
     : ChangeProcessor(error_handler),
       type_(type),
       local_service_(local_service),
       merge_result_(merge_result),
       share_handle_(user_share),
       weak_ptr_factory_(this) {
   DCHECK(CalledOnValidThread());
   DCHECK_NE(type_, syncer::UNSPECIFIED);
   if (attachment_store) {
     std::string store_birthday;
@@ skipping 611 matching lines @@
   }
 }
 
 scoped_ptr<syncer::AttachmentService>
 GenericChangeProcessor::GetAttachmentService() const {
   return scoped_ptr<syncer::AttachmentService>(
       new syncer::AttachmentServiceProxy(attachment_service_proxy_));
 }
 
 }  // namespace sync_driver