postMessage() should throw a DataCloneError on invalid transferables

Source/core/dom/MessagePort.cpp

Index: Source/core/dom/MessagePort.cpp
diff --git a/Source/core/dom/MessagePort.cpp b/Source/core/dom/MessagePort.cpp
index 07b4eb1f40cf2cd861515f532781dad9ddb8a0a7..be7ab6678190d0e59b69790efaf82d40df1c052c 100644
--- a/Source/core/dom/MessagePort.cpp
+++ b/Source/core/dom/MessagePort.cpp
@@ -68,7 +68,7 @@ void MessagePort::postMessage(PassRefPtr<SerializedScriptValue> message, const M
         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;
             }
         }