Roll WebKit IDL to multivm@858

third_party/WebCore/editing/UndoManager.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 23 matching lines @@
         Conditional=UNDO_MANAGER,
         V8GenerateIsReachable=ImplOwnerNodeRoot
     ] UndoManager {
         [Custom] void transact(in Dictionary transaction, in boolean merge);
 
         void undo()
             raises(DOMException);
         void redo()
             raises(DOMException);
 
+        [Custom] sequence<DOMTransaction> item(in unsigned long index);
+
         readonly attribute unsigned long length;
         readonly attribute unsigned long position;
 
         void clearUndo()
             raises(DOMException);
         void clearRedo()
             raises(DOMException);
     };
 
 }