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

third_party/WebKit/Source/core/dom/shadow/ShadowRoot.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 14 matching lines @@
  */
 
 // https://w3c.github.io/webcomponents/spec/shadow/#the-shadowroot-interface
 
 interface ShadowRoot : DocumentFragment {
     readonly attribute ShadowRootMode mode;
     readonly attribute Element host;
     [ImplementedAs=olderShadowRootForBindings] readonly attribute ShadowRoot? olderShadowRoot;
     [TreatNullAs=NullString, CEReactions, CustomElementCallbacks, RaisesException=Setter] attribute DOMString innerHTML;
     readonly attribute boolean delegatesFocus;
-
-    // TODO(foolip): The spec does not override cloneNode() on the ShadowRoot
-    // interface. Here, it's used to implement "Invoking the cloneNode() method
-    // on a ShadowRoot instance must always throw a DATA_CLONE_ERR exception" as
-    // Node.cloneNode() does not have [RaisesException].
-    [RaisesException] Node cloneNode(optional boolean deep = false);
 };
 
 ShadowRoot implements DocumentOrShadowRoot;