*** DO NOT LAND *** Attempt to understand Regions complexity

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 16 matching lines @@
 #define RenderTreeBuilder_h
 
 #include "core/dom/Document.h"
 #include "core/dom/Node.h"
 #include "core/dom/NodeRenderingTraversal.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 class ContainerNode;
-class RenderNamedFlowThread;
 class RenderObject;
 class RenderStyle;
 
 class RenderTreeBuilder {
 public:
     RenderTreeBuilder(Node* node, RenderStyle* style)
         : m_node(node)
         , m_renderingParent(0)
         , m_style(style)
-        , m_parentFlowRenderer(0)
     {
         ASSERT(!node->renderer());
         ASSERT(node->needsAttach());
         ASSERT(node->document().inStyleRecalc());
 
         // FIXME: We should be able to ASSERT(node->inActiveDocument()) but childrenChanged is called
         // before ChildNodeInsertionNotifier in ContainerNode's methods and some implementations
         // will trigger a layout inside childrenChanged.
         // Mainly HTMLTextAreaElement::childrenChanged calls HTMLTextFormControlElement::setSelectionRange
         // which does an updateLayoutIgnorePendingStylesheets.
 
         m_renderingParent = NodeRenderingTraversal::parent(node, &m_parentDetails);
     }
 
     void createRendererForTextIfNeeded();
     void createRendererForElementIfNeeded();
 
 private:
     RenderObject* parentRenderer() const;
     RenderObject* nextRenderer() const;
     bool shouldCreateRenderer() const;
     RenderStyle& style() const;
 
-    bool shouldMoveToFlowThread() const;
-    void moveToFlowThreadIfNeeded();
-    bool elementInsideRegionNeedsRenderer();
-
     Node* m_node;
     ContainerNode* m_renderingParent;
     NodeRenderingTraversal::ParentDetails m_parentDetails;
     mutable RefPtr<RenderStyle> m_style;
-    RenderNamedFlowThread* m_parentFlowRenderer;
 };
 
 } // namespace WebCore
 
 #endif