[Sync] Replace AttachmentIdSet with AttachmentIdList in interfaces.

sync/syncable/directory.h

 // Copyright 2013 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_SYNCABLE_DIRECTORY_H_
 #define SYNC_SYNCABLE_DIRECTORY_H_
 
 #include <deque>
 #include <set>
 #include <string>
@@ skipping 399 matching lines @@
   void GetMetahandlesByAttachmentId(
       BaseTransaction* trans,
       const sync_pb::AttachmentIdProto& attachment_id_proto,
       Metahandles* result);
 
   // Change entry to not dirty. Used in special case when we don't want to
   // persist modified entry on disk. e.g. SyncBackupManager uses this to
   // preserve sync preferences in DB on disk.
   void UnmarkDirtyEntry(WriteTransaction* trans, Entry* entry);
 
-  // Clears |id_set| and fills it with the ids of attachments that need to be
+  // Clears |ids| and fills it with the ids of attachments that need to be
   // uploaded to the sync server.
   void GetAttachmentIdsToUpload(BaseTransaction* trans,
                                 ModelType type,
-                                AttachmentIdSet* id_set);
+                                AttachmentIdList* ids);
 
  private:
   struct Kernel {
     // |delegate| must not be NULL.  |transaction_observer| must be
     // initialized.
     Kernel(const std::string& name, const KernelLoadInfo& info,
            DirectoryChangeDelegate* delegate,
            const WeakHandle<TransactionObserver>& transaction_observer);
 
     ~Kernel();
@@ skipping 212 matching lines @@
   // are deleted in native models as well.
   scoped_ptr<DeleteJournal> delete_journal_;
 
   DISALLOW_COPY_AND_ASSIGN(Directory);
 };
 
 }  // namespace syncable
 }  // namespace syncer
 
 #endif // SYNC_SYNCABLE_DIRECTORY_H_