Make RenderObject::style() return a const object

Source/core/rendering/style/RenderStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 142 matching lines @@
 
 static StyleRecalcChange diffPseudoStyles(const RenderStyle* oldStyle, const RenderStyle* newStyle)
 {
     // If the pseudoStyles have changed, we want any StyleRecalcChange that is not NoChange
     // because setStyle will do the right thing with anything else.
     if (!oldStyle->hasAnyPublicPseudoStyles())
         return NoChange;
     for (PseudoId pseudoId = FIRST_PUBLIC_PSEUDOID; pseudoId < FIRST_INTERNAL_PSEUDOID; pseudoId = static_cast<PseudoId>(pseudoId + 1)) {
         if (!oldStyle->hasPseudoStyle(pseudoId))
             continue;
-        RenderStyle* newPseudoStyle = newStyle->getCachedPseudoStyle(pseudoId);
+        const RenderStyle* newPseudoStyle = newStyle->getCachedPseudoStyle(pseudoId);
         if (!newPseudoStyle)
             return NoInherit;
-        RenderStyle* oldPseudoStyle = oldStyle->getCachedPseudoStyle(pseudoId);
+        const RenderStyle* oldPseudoStyle = oldStyle->getCachedPseudoStyle(pseudoId);
         if (oldPseudoStyle && *oldPseudoStyle != *newPseudoStyle)
             return NoInherit;
     }
     return NoChange;
 }
 
 StyleRecalcChange RenderStyle::stylePropagationDiff(const RenderStyle* oldStyle, const RenderStyle* newStyle)
 {
     if ((!oldStyle && newStyle) || (oldStyle && !newStyle))
         return Reattach;
@@ skipping 145 matching lines @@
     m_cachedPseudoStyles->append(pseudo);
 
     return result;
 }
 
 void RenderStyle::removeCachedPseudoStyle(PseudoId pid)
 {
     if (!m_cachedPseudoStyles)
         return;
     for (size_t i = 0; i < m_cachedPseudoStyles->size(); ++i) {
-        RenderStyle* pseudoStyle = m_cachedPseudoStyles->at(i).get();
+        const RenderStyle* pseudoStyle = m_cachedPseudoStyles->at(i).get();
         if (pseudoStyle->styleType() == pid) {
             m_cachedPseudoStyles->remove(i);
             return;
         }
     }
 }
 
 bool RenderStyle::inheritedNotEqual(const RenderStyle* other) const
 {
     return inherited_flags != other->inherited_flags
@@ skipping 1314 matching lines @@
         horizontal || includeLogicalRightEdge);
 
     edges[BSLeft] = BorderEdge(borderLeftWidth(),
         visitedDependentColor(CSSPropertyBorderLeftColor),
         borderLeftStyle(),
         borderLeftIsTransparent(),
         !horizontal || includeLogicalLeftEdge);
 }
 
 } // namespace blink