Const-ify static s_resourceType members in RenderSVGResouce* classes

Source/core/rendering/svg/RenderSVGResourcePattern.h

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright 2014 The Chromium Authors. 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 30 matching lines @@
 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(const RenderObject&) override;
 
+    static const RenderSVGResourceType s_resourceType = PatternResourceType;
     virtual RenderSVGResourceType resourceType() const override { return s_resourceType; }
-    static const RenderSVGResourceType s_resourceType;
 
 private:
     PassOwnPtr<PatternData> buildPatternData(const RenderObject&);
     PassRefPtr<DisplayList> asDisplayList(const FloatRect& tileBounds, const AffineTransform&) const;
     PatternData* patternForRenderer(const RenderObject&);
 
     bool m_shouldCollectPatternAttributes : 1;
     PatternAttributes m_attributes;
 
     // FIXME: we can almost do away with this per-object map, but not quite: the tile size can be
     // relative to the client bounding box, and it gets captured in the cached Pattern shader.
     // Hence, we need one Pattern shader per client. The display list OTOH is the same => we
     // should be able to cache a single display list per RenderSVGResourcePattern + one
     // Pattern(shader) for each client -- this would avoid re-recording when multiple clients
     // share the same pattern.
     HashMap<const RenderObject*, OwnPtr<PatternData> > m_patternMap;
 };
 
 }
 
 #endif