Make RenderObject::style() return a const object

Source/core/rendering/RenderMultiColumnSet.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 22 matching lines @@
 
 RenderMultiColumnSet::RenderMultiColumnSet(RenderFlowThread* flowThread)
     : RenderRegion(0, flowThread)
     , m_columnHeight(0)
     , m_maxColumnHeight(RenderFlowThread::maxLogicalHeight())
     , m_minSpaceShortage(RenderFlowThread::maxLogicalHeight())
     , m_minimumColumnHeight(0)
 {
 }
 
-RenderMultiColumnSet* RenderMultiColumnSet::createAnonymous(RenderFlowThread* flowThread, RenderStyle* parentStyle)
+RenderMultiColumnSet* RenderMultiColumnSet::createAnonymous(RenderFlowThread* flowThread, const RenderStyle* parentStyle)
 {
     Document& document = flowThread->document();
     RenderMultiColumnSet* renderer = new RenderMultiColumnSet(flowThread);
     renderer->setDocumentForAnonymous(&document);
     renderer->setStyle(RenderStyle::createAnonymousStyleWithDisplay(parentStyle, BLOCK));
     return renderer;
 }
 
 RenderMultiColumnSet* RenderMultiColumnSet::nextSiblingMultiColumnSet() const
 {
@@ skipping 272 matching lines @@
 
 void RenderMultiColumnSet::computeLogicalHeight(LayoutUnit, LayoutUnit logicalTop, LogicalExtentComputedValues& computedValues) const
 {
     computedValues.m_extent = m_columnHeight;
     computedValues.m_position = logicalTop;
 }
 
 LayoutUnit RenderMultiColumnSet::calculateMaxColumnHeight() const
 {
     RenderBlockFlow* multicolBlock = multiColumnBlockFlow();
-    RenderStyle* multicolStyle = multicolBlock->style();
+    const RenderStyle* multicolStyle = multicolBlock->style();
     LayoutUnit availableHeight = multiColumnFlowThread()->columnHeightAvailable();
     LayoutUnit maxColumnHeight = availableHeight ? availableHeight : RenderFlowThread::maxLogicalHeight();
     if (!multicolStyle->logicalMaxHeight().isMaxSizeNone()) {
         LayoutUnit logicalMaxHeight = multicolBlock->computeContentLogicalHeight(multicolStyle->logicalMaxHeight(), -1);
         if (logicalMaxHeight != -1 && maxColumnHeight > logicalMaxHeight)
             maxColumnHeight = logicalMaxHeight;
     }
     return heightAdjustedForSetOffset(maxColumnHeight);
 }
 
@@ skipping 277 matching lines @@
 
 void RenderMultiColumnSet::detachRegion()
 {
     if (m_flowThread) {
         m_flowThread->removeRegionFromThread(this);
         m_flowThread = 0;
     }
 }
 
 }