Make RenderObject::style() return a const object

Source/core/html/HTMLFrameSetElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann (hausmann@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2009, 2010 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 136 matching lines @@
         HTMLElement::parseAttribute(name, value);
 }
 
 bool HTMLFrameSetElement::rendererIsNeeded(const RenderStyle& style)
 {
     // For compatibility, frames render even when display: none is set.
     // However, we delay creating a renderer until stylesheets have loaded.
     return style.isStyleAvailable();
 }
 
-RenderObject* HTMLFrameSetElement::createRenderer(RenderStyle *style)
+RenderObject* HTMLFrameSetElement::createRenderer(const RenderStyle *style)
 {
     if (style->hasContent())
         return RenderObject::createObject(this, style);
 
     return new RenderFrameSet(this);
 }
 
 void HTMLFrameSetElement::attach(const AttachContext& context)
 {
     // Inherit default settings from parent frameset
@@ skipping 47 matching lines @@
     Element* frameElement = children()->namedItem(name);
     if (!isHTMLFrameElement(frameElement))
         return nullptr;
     Document* document = toHTMLFrameElement(frameElement)->contentDocument();
     if (!document || !document->frame())
         return nullptr;
     return document->domWindow();
 }
 
 } // namespace blink