[Sync] Replace AttachmentIdSet with AttachmentIdList in interfaces.

sync/internal_api/public/attachments/attachment_service.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_H_
 #define SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_SERVICE_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 50 matching lines @@
   // the server.
   //
   // Assumes the attachments are already in the attachment store.
   //
   // A request to upload attachments is persistent in that uploads will be
   // automatically retried if transient errors occur.
   //
   // A request to upload attachments does not persist across restarts of Chrome.
   //
   // Invokes OnAttachmentUploaded on the Delegate (if provided).
-  virtual void UploadAttachments(const AttachmentIdSet& attachment_ids) = 0;
+  virtual void UploadAttachments(const AttachmentIdList& attachment_ids) = 0;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_SERVICE_H_