Revert 190605 "Make RenderObject::style() return a const object"

trunk/Source/core/layout/MultiColumnFragmentainerGroup.cpp

Index: trunk/Source/core/layout/MultiColumnFragmentainerGroup.cpp
===================================================================
--- trunk/Source/core/layout/MultiColumnFragmentainerGroup.cpp	(revision 190671)
+++ trunk/Source/core/layout/MultiColumnFragmentainerGroup.cpp	(working copy)
@@ -306,11 +306,11 @@
 LayoutUnit MultiColumnFragmentainerGroup::calculateMaxColumnHeight() const
 {
     RenderBlockFlow* multicolBlock = m_columnSet.multiColumnBlockFlow();
-    const LayoutStyle& multicolStyle = multicolBlock->styleRef();
+    LayoutStyle* multicolStyle = multicolBlock->style();
     LayoutUnit availableHeight = m_columnSet.multiColumnFlowThread()->columnHeightAvailable();
     LayoutUnit maxColumnHeight = availableHeight ? availableHeight : LayoutFlowThread::maxLogicalHeight();
-    if (!multicolStyle.logicalMaxHeight().isMaxSizeNone()) {
-        LayoutUnit logicalMaxHeight = multicolBlock->computeContentLogicalHeight(multicolStyle.logicalMaxHeight(), -1);
+    if (!multicolStyle->logicalMaxHeight().isMaxSizeNone()) {
+        LayoutUnit logicalMaxHeight = multicolBlock->computeContentLogicalHeight(multicolStyle->logicalMaxHeight(), -1);
         if (logicalMaxHeight != -1 && maxColumnHeight > logicalMaxHeight)
             maxColumnHeight = logicalMaxHeight;
     }