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

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

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2006 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 59 matching lines @@
     m_listenerForXSLT = listener;
   }
   EventListener* eventListenerForXSLT();
   void clearEventListenerForXSLT();
 
  private:
   ProcessingInstruction(Document&, const String& target, const String& data);
 
   String nodeName() const override;
   NodeType getNodeType() const override;
-  Node* cloneNode(bool deep) override;
+  Node* cloneNode(bool deep, ExceptionState&) override;
 
   InsertionNotificationRequest insertedInto(ContainerNode*) override;
   void removedFrom(ContainerNode*) override;
 
   bool checkStyleSheet(String& href, String& charset);
   void process(const String& href, const String& charset);
 
   void setCSSStyleSheet(const String& href,
                         const KURL& baseURL,
                         const String& charset,
@@ skipping 27 matching lines @@
                        getNodeType() == Node::kProcessingInstructionNode);
 
 inline bool isXSLStyleSheet(const Node& node) {
   return node.getNodeType() == Node::kProcessingInstructionNode &&
          toProcessingInstruction(node).isXSL();
 }
 
 }  // namespace blink
 
 #endif  // ProcessingInstruction_h