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

trunk/Source/core/dom/NodeLayoutStyle.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2008 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. 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
@@ skipping 15 matching lines @@
 #define NodeLayoutStyle_h
 
 #include "core/dom/Node.h"
 #include "core/dom/NodeRenderingTraversal.h"
 #include "core/html/HTMLOptGroupElement.h"
 #include "core/layout/LayoutObject.h"
 #include "core/layout/style/LayoutStyle.h"
 
 namespace blink {
 
-inline LayoutStyle* Node::mutableLayoutStyle() const
+inline LayoutStyle* Node::layoutStyle() const
 {
     if (LayoutObject* renderer = this->renderer())
-        return renderer->mutableStyle();
+        return renderer->style();
     // <option> and <optgroup> can be styled even if they don't get renderers,
     // so they store their style internally and return it through nonRendererStyle().
     // We check here explicitly to avoid the virtual call in the common case.
     if (isHTMLOptGroupElement(*this) || isHTMLOptionElement(this))
         return nonRendererStyle();
     return 0;
 }
 
-inline const LayoutStyle* Node::layoutStyle() const
-{
-    return mutableLayoutStyle();
-}
-
-inline const LayoutStyle* Node::parentLayoutStyle() const
+inline LayoutStyle* Node::parentLayoutStyle() const
 {
     ContainerNode* parent = NodeRenderingTraversal::parent(*this);
     return parent ? parent->layoutStyle() : 0;
 }
 
 inline const LayoutStyle& Node::layoutStyleRef() const
 {
     const LayoutStyle* style = layoutStyle();
     ASSERT(style);
     return *style;
 }
 
 }
 #endif // NodeLayoutStyle_h