Make RenderObject::style() return a const object

Source/core/html/HTMLImageElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 314 matching lines @@
         SizesAttributeParser parser = SizesAttributeParser(MediaValuesDynamic::create(document()), sizes);
         float effectiveSize = parser.length();
         ImageCandidate candidate = bestFitSourceForSrcsetAttribute(document().devicePixelRatio(), effectiveSize, source->fastGetAttribute(srcsetAttr), &document());
         if (candidate.isEmpty())
             continue;
         return candidate;
     }
     return ImageCandidate();
 }
 
-RenderObject* HTMLImageElement::createRenderer(RenderStyle* style)
+RenderObject* HTMLImageElement::createRenderer(const RenderStyle* style)
 {
     if (style->hasContent())
         return RenderObject::createObject(this, style);
 
     if (m_useFallbackContent)
         return new RenderBlockFlow(this);
 
     RenderImage* image = new RenderImage(this);
     image->setImageResource(RenderImageResource::create());
     image->setImageDevicePixelRatio(m_imageDevicePixelRatio);
@@ skipping 371 matching lines @@
 }
 
 void HTMLImageElement::setUseFallbackContent()
 {
     m_useFallbackContent = true;
     if (document().inStyleRecalc())
         return;
     ensureUserAgentShadowRoot();
 }
 }