Introduce ChildNode IDL interface

Source/core/dom/ChildNode.idl

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
+ * Copyright (C) 2013 Samsung Electronics. 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
-// Introduced in DOM Level 2:
-[
-    GenerateIsReachable=document,
-] interface StyleSheetList {
-    readonly attribute unsigned long    length;
-    getter StyleSheet         item([Default=Undefined] optional unsigned long index);
-    [ImplementedAs=anonymousNamedGetter, NotEnumerable] getter CSSStyleSheet (DOMString name);
+[NoInterfaceObject]
+interface ChildNode {
+    [PerWorldBindings] readonly attribute Element previousElementSibling;
+    [PerWorldBindings] readonly attribute Element nextElementSibling;
+    [RaisesException] void remove();
 };
 
+DocumentType implements ChildNode;
+Element implements ChildNode;
+CharacterData implements ChildNode;