[Sync] Replace AttachmentIdSet with AttachmentIdList in interfaces.

sync/internal_api/public/attachments/attachment_service_impl.h

 // 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.
 
 #ifndef SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_SERVICE_IMPL_H_
 #define SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_SERVICE_IMPL_H_
 
 #include <deque>
 
 #include "base/memory/ref_counted.h"
@@ skipping 46 matching lines @@
                         const base::TimeDelta& initial_backoff_delay,
                         const base::TimeDelta& max_backoff_delay);
   ~AttachmentServiceImpl() override;
 
   // Create an AttachmentServiceImpl suitable for use in tests.
   static scoped_ptr<syncer::AttachmentService> CreateForTest();
 
   // AttachmentService implementation.
   void GetOrDownloadAttachments(const AttachmentIdList& attachment_ids,
                                 const GetOrDownloadCallback& callback) override;
-  void UploadAttachments(const AttachmentIdSet& attachment_ids) override;
+  void UploadAttachments(const AttachmentIdList& attachment_ids) override;
 
   // NetworkChangeObserver implementation.
   void OnNetworkChanged(
       net::NetworkChangeNotifier::ConnectionType type) override;
 
   // Use |timer| in the underlying TaskQueue.
   //
   // Used in tests.  See also MockTimer.
   void SetTimerForTest(scoped_ptr<base::Timer> timer);
 
@@ skipping 34 matching lines @@
 
   // Must be last data member.
   base::WeakPtrFactory<AttachmentServiceImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AttachmentServiceImpl);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_SERVICE_IMPL_H_