Port Node's previousElementSibling() / nextElementSibling() to ElementTraversal

Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 23 matching lines @@
 #include "core/dom/Attribute.h"
 #include "core/dom/ChildListMutationScope.h"
 #include "core/dom/ChildNodeList.h"
 #include "core/dom/DOMImplementation.h"
 #include "core/dom/Document.h"
 #include "core/dom/DocumentFragment.h"
 #include "core/dom/DocumentMarkerController.h"
 #include "core/dom/DocumentType.h"
 #include "core/dom/Element.h"
 #include "core/dom/ElementRareData.h"
+#include "core/dom/ElementTraversal.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/LiveNodeList.h"
 #include "core/dom/NodeRareData.h"
 #include "core/dom/NodeRenderingTraversal.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/ProcessingInstruction.h"
 #include "core/dom/Range.h"
 #include "core/dom/StaticNodeList.h"
 #include "core/dom/TemplateContentDocumentFragment.h"
 #include "core/dom/Text.h"
@@ skipping 2487 matching lines @@
     }
 
     ASSERT(isHTMLElement() || isSVGElement());
     setFlag(CustomElement);
     setFlag(newState == Upgraded, CustomElementUpgraded);
 
     if (oldState == NotCustomElement || newState == Upgraded)
         setNeedsStyleRecalc(SubtreeStyleChange); // :unresolved has changed
 }
 
+Element* Node::previousElementSibling() const
+{
+    return ElementTraversal::previousSibling(*this);
+}
+
+Element* Node::nextElementSibling() const
+{
+    return ElementTraversal::nextSibling(*this);
+}
+
 } // namespace WebCore
 
 #ifndef NDEBUG
 
 void showTree(const WebCore::Node* node)
 {
     if (node)
         node->showTreeForThis();
 }
 
 void showNodePath(const WebCore::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif