postMessage() should throw a DataCloneError on invalid transferables

Source/core/dom/MessagePort.cpp

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 50 matching lines @@
     if (!isEntangled())
         return;
     ASSERT(m_scriptExecutionContext);
 
     OwnPtr<MessagePortChannelArray> channels;
     // Make sure we aren't connected to any of the passed-in ports.
     if (ports) {
         for (unsigned int i = 0; i < ports->size(); ++i) {
             MessagePort* dataPort = (*ports)[i].get();
             if (dataPort == this || m_entangledChannel->isConnectedTo(dataPort)) {
-                es.throwDOMException(InvalidStateError);
+                es.throwDOMException(DataCloneError);
                 return;
             }
         }
         channels = MessagePort::disentanglePorts(ports, es);
         if (es.hadException())
             return;
     }
     m_entangledChannel->postMessageToRemote(message, channels.release());
 }
 
@@ skipping 152 matching lines @@
 {
     return &m_eventTargetData;
 }
 
 EventTargetData* MessagePort::ensureEventTargetData()
 {
     return &m_eventTargetData;
 }
 
 } // namespace WebCore