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

third_party/WebKit/Source/core/dom/DocumentFragment.cpp

 /*
  * 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, 2005, 2006, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 39 matching lines @@
     case kProcessingInstructionNode:
     case kCommentNode:
     case kTextNode:
     case kCdataSectionNode:
       return true;
     default:
       return false;
   }
 }
 
-Node* DocumentFragment::cloneNode(bool deep) {
+Node* DocumentFragment::cloneNode(bool deep, ExceptionState&) {
   DocumentFragment* clone = create(document());
   if (deep)
     cloneChildNodes(clone);
   return clone;
 }
 
 void DocumentFragment::parseHTML(const String& source,
                                  Element* contextElement,
                                  ParserContentPolicy parserContentPolicy) {
   HTMLDocumentParser::parseDocumentFragment(source, this, contextElement,
                                             parserContentPolicy);
 }
 
 bool DocumentFragment::parseXML(const String& source,
                                 Element* contextElement,
                                 ParserContentPolicy parserContentPolicy) {
   return XMLDocumentParser::parseDocumentFragment(source, this, contextElement,
                                                   parserContentPolicy);
 }
 
 }  // namespace blink