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

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * 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 39 matching lines @@
     [PerWorldBindings] readonly attribute Node? lastChild;
     [PerWorldBindings] readonly attribute Node? previousSibling;
     [PerWorldBindings] readonly attribute Node? nextSibling;
     [MeasureAs=NodeGetRootNode] Node getRootNode(optional GetRootNodeOptions options);
 
     [CEReactions, CustomElementCallbacks] attribute DOMString? nodeValue;
 
     [CEReactions, CustomElementCallbacks] attribute DOMString? textContent;
     [CEReactions, CustomElementCallbacks] void normalize();
 
-    [NewObject, DoNotTestNewObject, CEReactions, CustomElementCallbacks] Node cloneNode(optional boolean deep = false);
+    [NewObject, DoNotTestNewObject, CEReactions, CustomElementCallbacks, RaisesException] Node cloneNode(optional boolean deep = false);
     boolean isEqualNode(Node? otherNode);
     boolean isSameNode(Node? otherNode); // historical alias of ===
 
     const unsigned short DOCUMENT_POSITION_DISCONNECTED = 0x01;
     const unsigned short DOCUMENT_POSITION_PRECEDING = 0x02;
     const unsigned short DOCUMENT_POSITION_FOLLOWING = 0x04;
     const unsigned short DOCUMENT_POSITION_CONTAINS = 0x08;
     const unsigned short DOCUMENT_POSITION_CONTAINED_BY = 0x10;
     const unsigned short DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = 0x20;
     unsigned short compareDocumentPosition(Node other);
     boolean contains(Node? other);
 
     DOMString? lookupPrefix(DOMString? namespaceURI);
     DOMString? lookupNamespaceURI(DOMString? prefix);
     boolean isDefaultNamespace(DOMString? namespaceURI);
 
     [CEReactions, CustomElementCallbacks, PerWorldBindings, RaisesException] Node insertBefore(Node node, Node? child);
     [CEReactions, CustomElementCallbacks, PerWorldBindings, RaisesException] Node appendChild(Node node);
     [CEReactions, CustomElementCallbacks, PerWorldBindings, RaisesException] Node replaceChild(Node node, Node child);
     [CEReactions, CustomElementCallbacks, RaisesException] Node removeChild(Node child);
 };