Move rendering/RenderBox to layout/LayoutBox.

Source/core/layout/LayoutObjectChildList.h

 /*
  * Copyright (C) 2009 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 27 matching lines @@
 public:
     LayoutObjectChildList()
         : m_firstChild(nullptr)
         , m_lastChild(nullptr)
     {
     }
 
     LayoutObject* firstChild() const { return m_firstChild; }
     LayoutObject* lastChild() const { return m_lastChild; }
 
-    // FIXME: Temporary while RenderBox still exists. Eventually this will just happen during insert/append/remove methods on the child list, and nobody
+    // FIXME: Temporary while LayoutBox still exists. Eventually this will just happen during insert/append/remove methods on the child list, and nobody
     // will need to manipulate firstChild or lastChild directly.
     void setFirstChild(LayoutObject* child) { m_firstChild = child; }
     void setLastChild(LayoutObject* child) { m_lastChild = child; }
 
     void destroyLeftoverChildren();
 
     LayoutObject* removeChildNode(LayoutObject* owner, LayoutObject*, bool notifyRenderer = true);
     void insertChildNode(LayoutObject* owner, LayoutObject* newChild, LayoutObject* beforeChild, bool notifyRenderer = true);
     void appendChildNode(LayoutObject* owner, LayoutObject* newChild, bool notifyRenderer = true)
     {
         insertChildNode(owner, newChild, 0, notifyRenderer);
     }
 
 private:
     void invalidatePaintOnRemoval(const LayoutObject& oldChild);
 
     LayoutObject* m_firstChild;
     LayoutObject* m_lastChild;
 };
 
 } // namespace blink
 
 #endif // LayoutObjectChildList_h