[Sync] Replace AttachmentIdSet with AttachmentIdList in interfaces.

sync/internal_api/read_transaction.cc

 // Copyright 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.
 
 #include "sync/internal_api/public/read_transaction.h"
 
 #include "sync/syncable/directory.h"
 #include "sync/syncable/syncable_read_transaction.h"
 
 namespace syncer {
@@ skipping 30 matching lines @@
 }
 
 void ReadTransaction::GetDataTypeContext(
     ModelType type,
     sync_pb::DataTypeContext* context) const {
   return transaction_->directory()->GetDataTypeContext(
       transaction_, type, context);
 }
 
 void ReadTransaction::GetAttachmentIdsToUpload(ModelType type,
-                                               AttachmentIdSet* id_set) const {
-  DCHECK(id_set);
-  transaction_->directory()->GetAttachmentIdsToUpload(
-      transaction_, type, id_set);
+                                               AttachmentIdList* ids) const {
+  DCHECK(ids);
+  transaction_->directory()->GetAttachmentIdsToUpload(transaction_, type, ids);
 }
 
 std::string ReadTransaction::GetStoreBirthday() const {
   return transaction_->directory()->store_birthday();
 }
 
 }  // namespace syncer