Make RenderObject::style() return a const object

Source/core/layout/LayoutTable.cpp

Index: Source/core/layout/LayoutTable.cpp
diff --git a/Source/core/layout/LayoutTable.cpp b/Source/core/layout/LayoutTable.cpp
index ae01460b50ad69914093e7b83218b2997be0bc7e..9f7c5396e64b2bdd29f97bf0d2fe42648e29a436 100644
--- a/Source/core/layout/LayoutTable.cpp
+++ b/Source/core/layout/LayoutTable.cpp
@@ -678,7 +678,7 @@ void LayoutTable::computePreferredLogicalWidths()
     for (unsigned i = 0; i < m_captions.size(); i++)
         m_minPreferredLogicalWidth = std::max(m_minPreferredLogicalWidth, m_captions[i]->minPreferredLogicalWidth());
 
-    RenderStyle* styleToUse = style();
+    const RenderStyle* styleToUse = style();
     // FIXME: This should probably be checking for isSpecified since you should be able to use percentage or calc values for min-width.
     if (styleToUse->logicalMinWidth().isFixed() && styleToUse->logicalMinWidth().value() > 0) {
         m_maxPreferredLogicalWidth = std::max(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMinWidth().value()));