Pass more const RenderObject& in the vicinity of paint-servers

Source/core/rendering/svg/RenderSVGResourcePattern.h

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010. 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 33 matching lines @@
 
 class RenderSVGResourcePattern final : public RenderSVGResourceContainer {
 public:
     explicit RenderSVGResourcePattern(SVGPatternElement*);
 
     virtual const char* renderName() const override { return "RenderSVGResourcePattern"; }
 
     virtual void removeAllClientsFromCache(bool markForInvalidation = true) override;
     virtual void removeClientFromCache(RenderObject*, bool markForInvalidation = true) override;
 
-    virtual SVGPaintServer preparePaintServer(RenderObject*) override;
+    virtual SVGPaintServer preparePaintServer(const RenderObject&) override;
 
     virtual RenderSVGResourceType resourceType() const override { return s_resourceType; }
     static const RenderSVGResourceType s_resourceType;
 
 private:
-    bool buildTileImageTransform(RenderObject*, const PatternAttributes&, const SVGPatternElement*, FloatRect& patternBoundaries, AffineTransform& tileImageTransform) const;
+    bool buildTileImageTransform(const RenderObject&, const PatternAttributes&, const SVGPatternElement*, FloatRect& patternBoundaries, AffineTransform& tileImageTransform) const;
 
     PassOwnPtr<ImageBuffer> createTileImage(const PatternAttributes&, const FloatRect& tileBoundaries,
                                             const FloatRect& absoluteTileBoundaries, const AffineTransform& tileImageTransform) const;
 
-    PatternData* buildPattern(RenderObject*, const SVGPatternElement*);
+    PatternData* buildPattern(const RenderObject&, const SVGPatternElement*);
 
     bool m_shouldCollectPatternAttributes : 1;
     PatternAttributes m_attributes;
-    HashMap<RenderObject*, OwnPtr<PatternData> > m_patternMap;
+    HashMap<const RenderObject*, OwnPtr<PatternData> > m_patternMap;
 };
 
 }
 
 #endif