Move rendering/RenderBox to layout/LayoutBox.

Source/core/layout/LayoutMultiColumnSet.cpp

 /*
  * Copyright (C) 2012 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 82 matching lines @@
 {
     return lastFragmentainerGroup().logicalBottomInFlowThread();
 }
 
 bool LayoutMultiColumnSet::heightIsAuto() const
 {
     LayoutMultiColumnFlowThread* flowThread = multiColumnFlowThread();
     if (!flowThread->isLayoutPagedFlowThread()) {
         if (multiColumnBlockFlow()->style()->columnFill() == ColumnFillBalance)
             return true;
-        if (RenderBox* next = nextSiblingBox()) {
+        if (LayoutBox* next = nextSiblingBox()) {
             if (next->isLayoutMultiColumnSpannerPlaceholder()) {
                 // If we're followed by a spanner, we need to balance.
                 return true;
             }
         }
     }
     return !flowThread->columnHeightAvailable();
 }
 
 LayoutSize LayoutMultiColumnSet::flowThreadTranslationAtOffset(LayoutUnit blockOffset) const
@@ skipping 154 matching lines @@
 
 LayoutRect LayoutMultiColumnSet::flowThreadPortionRect() const
 {
     LayoutRect portionRect(LayoutUnit(), logicalTopInFlowThread(), pageLogicalWidth(), logicalHeightInFlowThread());
     if (!isHorizontalWritingMode())
         return portionRect.transposedRect();
     return portionRect;
 }
 
 }