Remove unnecessary override of Node#cloneNode in ShadowRoot's WebIDL

third_party/WebKit/Source/core/dom/Node.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004-2011, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 208 matching lines @@
   Node* insertBefore(Node* newChild,
                      Node* refChild,
                      ExceptionState& = ASSERT_NO_EXCEPTION);
   Node* replaceChild(Node* newChild,
                      Node* oldChild,
                      ExceptionState& = ASSERT_NO_EXCEPTION);
   Node* removeChild(Node* child, ExceptionState& = ASSERT_NO_EXCEPTION);
   Node* appendChild(Node* newChild, ExceptionState& = ASSERT_NO_EXCEPTION);
 
   bool hasChildren() const { return firstChild(); }
-  virtual Node* cloneNode(bool deep) = 0;
+  virtual Node* cloneNode(bool deep, ExceptionState& = ASSERT_NO_EXCEPTION) = 0;
   void normalize();
 
   bool isEqualNode(Node*) const;
   bool isSameNode(const Node* other) const { return this == other; }
   bool isDefaultNamespace(const AtomicString& namespaceURI) const;
   const AtomicString& lookupPrefix(const AtomicString& namespaceURI) const;
   const AtomicString& lookupNamespaceURI(const String& prefix) const;
 
   String textContent(bool convertBRsToNewlines = false) const;
   void setTextContent(const String&);
@@ skipping 780 matching lines @@
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showNode(const blink::Node*);
 void showTree(const blink::Node*);
 void showNodePath(const blink::Node*);
 #endif
 
 #endif  // Node_h