Implement WebIDL implements

Source/core/dom/Element.idl

 /*
  * Copyright (C) 2006, 2007, 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,
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     [PerWorldBindings] readonly attribute DOMStringMap dataset;
 
     // NodeSelector - Selector API
     [RaisesException] Element querySelector(DOMString selectors);
     [RaisesException] NodeList querySelectorAll(DOMString selectors);
 
     // WebKit extension, pending specification.
     [RaisesException] boolean webkitMatchesSelector([Default=Undefined] optional DOMString selectors);
 
-    // ParentNode interface API
-    [PerWorldBindings] readonly attribute HTMLCollection children;
-    [PerWorldBindings] readonly attribute Element firstElementChild;
-    [PerWorldBindings] readonly attribute Element lastElementChild;
-    [PerWorldBindings] readonly attribute unsigned long childElementCount;
-
     // ShadowAware API
     [Reflect=pseudo, ImplementedAs=pseudo, PerWorldBindings] attribute DOMString webkitPseudo;
     [ImplementedAs=createShadowRoot, RaisesException] ShadowRoot webkitCreateShadowRoot();
     [ImplementedAs=shadowRoot, PerWorldBindings] readonly attribute ShadowRoot webkitShadowRoot;
 
     // ChildNode interface API
     [PerWorldBindings] readonly attribute Element previousElementSibling;
     [PerWorldBindings] readonly attribute Element nextElementSibling;
     [RaisesException] void remove();
 
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     [NotEnumerable, PerWorldBindings] attribute EventListener onreset;
     [NotEnumerable, PerWorldBindings] attribute EventListener onsearch;
     [NotEnumerable, PerWorldBindings] attribute EventListener onselectstart;
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventListener ontouchstart;
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventListener ontouchmove;
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventListener ontouchend;
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventListener ontouchcancel;
     [NotEnumerable, PerWorldBindings] attribute EventListener onwebkitfullscreenchange;
     [NotEnumerable, PerWorldBindings] attribute EventListener onwebkitfullscreenerror;
 };