Make RenderObject::style() return a const object

Source/core/layout/LayoutTable.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 660 matching lines @@
 
     int bordersPaddingAndSpacing = bordersPaddingAndSpacingInRowDirection();
     m_minPreferredLogicalWidth += bordersPaddingAndSpacing;
     m_maxPreferredLogicalWidth += bordersPaddingAndSpacing;
 
     m_tableLayout->applyPreferredLogicalWidthQuirks(m_minPreferredLogicalWidth, m_maxPreferredLogicalWidth);
 
     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()));
         m_minPreferredLogicalWidth = std::max(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMinWidth().value()));
     }
 
     // FIXME: This should probably be checking for isSpecified since you should be able to use percentage or calc values for maxWidth.
     if (styleToUse->logicalMaxWidth().isFixed()) {
         // We don't constrain m_minPreferredLogicalWidth as the table should be at least the size of its min-content, regardless of 'max-width'.
         m_maxPreferredLogicalWidth = std::min(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMaxWidth().value()));
@@ skipping 652 matching lines @@
 const BorderValue& LayoutTable::tableEndBorderAdjoiningCell(const LayoutTableCell* cell) const
 {
     ASSERT(cell->isFirstOrLastCellInRow());
     if (hasSameDirectionAs(cell->row()))
         return style()->borderEnd();
 
     return style()->borderStart();
 }
 
 }