Make RenderObject::style() return a const object

Source/core/rendering/RenderMultiColumnSet.cpp

Index: Source/core/rendering/RenderMultiColumnSet.cpp
diff --git a/Source/core/rendering/RenderMultiColumnSet.cpp b/Source/core/rendering/RenderMultiColumnSet.cpp
index 4ad1c9d855d1defeb150ba44acaf9b931143bee7..d91011fabaf88bab8acc9fa018d7a1430d5e900d 100644
--- a/Source/core/rendering/RenderMultiColumnSet.cpp
+++ b/Source/core/rendering/RenderMultiColumnSet.cpp
@@ -40,7 +40,7 @@ RenderMultiColumnSet::RenderMultiColumnSet(RenderFlowThread* flowThread)
 {
 }
 
-RenderMultiColumnSet* RenderMultiColumnSet::createAnonymous(RenderFlowThread* flowThread, RenderStyle* parentStyle)
+RenderMultiColumnSet* RenderMultiColumnSet::createAnonymous(RenderFlowThread* flowThread, const RenderStyle* parentStyle)
 {
     Document& document = flowThread->document();
     RenderMultiColumnSet* renderer = new RenderMultiColumnSet(flowThread);
@@ -333,7 +333,7 @@ void RenderMultiColumnSet::computeLogicalHeight(LayoutUnit, LayoutUnit logicalTo
 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()) {