Fix parsing of DOMString[] in IDL

client/dom/generated/src/interface/IDBDatabase.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // WARNING: Do not edit - generated code.
 
 interface IDBDatabase {
 
   final String name;
 
@@ skipping 12 matching lines @@
   IDBObjectStore createObjectStore(String name);
 
   void deleteObjectStore(String name);
 
   bool dispatchEvent(Event evt);
 
   void removeEventListener(String type, EventListener listener, [bool useCapture]);
 
   IDBVersionChangeRequest setVersion(String version);
 
-  IDBTransaction transaction(String storeName, int mode);
+  IDBTransaction transaction(String storeName, [int mode]);
 }