Implement ParentNode IDL interface

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2318 matching lines @@
     resetNeedsShadowTreeWalker();
 }
 
 RenderObject* Element::pseudoElementRenderer(PseudoId pseudoId) const
 {
     if (PseudoElement* element = pseudoElement(pseudoId))
         return element->renderer();
     return 0;
 }
 
-// ElementTraversal API
-Element* Element::firstElementChild() const
-{
-    return ElementTraversal::firstWithin(this);
-}
-
-Element* Element::lastElementChild() const
-{
-    Node* n = lastChild();
-    while (n && !n->isElementNode())
-        n = n->previousSibling();
-    return toElement(n);
-}
-
-unsigned Element::childElementCount() const
-{
-    unsigned count = 0;
-    Node* n = firstChild();
-    while (n) {
-        count += n->isElementNode();
-        n = n->nextSibling();
-    }
-    return count;
-}
-
 bool Element::matchesReadOnlyPseudoClass() const
 {
     return false;
 }
 
 bool Element::matchesReadWritePseudoClass() const
 {
     return false;
 }
 
@@ skipping 767 matching lines @@
     return 0;
 }
 
 Attribute* UniqueElementData::attributeItem(unsigned index)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(index < length());
     return &m_attributeVector.at(index);
 }
 
 } // namespace WebCore