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

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 1358 matching lines @@
 
   void beginLifecycleUpdatesIfRenderingReady();
 
   bool isDocument() const final { return true; }
 
   void childrenChanged(const ChildrenChange&) override;
 
   String nodeName() const final;
   NodeType getNodeType() const final;
   bool childTypeAllowed(NodeType) const final;
-  Node* cloneNode(bool deep) final;
+  Node* cloneNode(bool deep, ExceptionState&) final;
   void cloneDataFromDocument(const Document&);
   bool isSecureContextImpl(
       const SecureContextCheck priviligeContextCheck) const;
 
   ShadowCascadeOrder m_shadowCascadeOrder = ShadowCascadeNone;
 
   // Same as url(), but needed for ExecutionContext to implement it without a
   // performance loss for direct calls.
   const KURL& virtualURL() const final;
   // Same as completeURL() for the same reason as above.
@@ skipping 331 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif  // Document_h