Clean up forward declarations in WebKit/Source

Source/core/dom/RenderTreeBuilder.h

 /*
  * 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, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2011 Google Inc. 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
@@ skipping 18 matching lines @@
 #include "core/dom/Document.h"
 #include "core/dom/FirstLetterPseudoElement.h"
 #include "core/dom/Node.h"
 #include "core/dom/NodeRenderingTraversal.h"
 #include "core/dom/Text.h"
 #include "core/rendering/RenderObject.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
-class ContainerNode;
 class RenderObject;
 class RenderStyle;
 
 template <typename NodeType>
 class RenderTreeBuilder {
     STACK_ALLOCATED();
 protected:
     RenderTreeBuilder(NodeType& node, RenderObject* renderingParent)
         : m_node(node)
         , m_renderingParent(renderingParent)
@@ skipping 50 matching lines @@
 public:
     RenderTreeBuilderForText(Text& text, RenderObject* renderingParent)
         : RenderTreeBuilder(text, renderingParent) { }
 
     void createRenderer();
 };
 
 } // namespace blink
 
 #endif