Make ShadowRoot.cloneNode() throw NotSupportedError, instead of DataCloneError.

third_party/WebKit/Source/core/dom/shadow/ShadowRoot.cpp

 /*
  * Copyright (C) 2011 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.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 95 matching lines @@
 {
     ShadowRoot* older = olderShadowRoot();
     while (older && !older->isOpenOrV0())
         older = older->olderShadowRoot();
     ASSERT(!older || older->isOpenOrV0());
     return older;
 }
 
 PassRefPtrWillBeRawPtr<Node> ShadowRoot::cloneNode(bool, ExceptionState& exceptionState)
 {
-    exceptionState.throwDOMException(DataCloneError, "ShadowRoot nodes are not clonable.");
+    exceptionState.throwDOMException(NotSupportedError, "ShadowRoot nodes are not clonable.");
     return nullptr;
 }
 
 String ShadowRoot::innerHTML() const
 {
     return createMarkup(this, ChildrenOnly);
 }
 
 void ShadowRoot::setInnerHTML(const String& markup, ExceptionState& exceptionState)
 {
@@ skipping 243 matching lines @@
 DEFINE_TRACE(ShadowRoot)
 {
     visitor->trace(m_prev);
     visitor->trace(m_next);
     visitor->trace(m_shadowRootRareData);
     TreeScope::trace(visitor);
     DocumentFragment::trace(visitor);
 }
 
 } // namespace blink