Const-ify static s_resourceType members in RenderSVGResouce* classes

Source/core/rendering/svg/RenderSVGResourceFilter.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.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
@@ skipping 15 matching lines @@
 
 #include "core/dom/ElementTraversal.h"
 #include "core/svg/SVGFilterPrimitiveStandardAttributes.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
 #include "platform/graphics/filters/SourceAlpha.h"
 #include "platform/graphics/filters/SourceGraphic.h"
 
 namespace blink {
 
-const RenderSVGResourceType RenderSVGResourceFilter::s_resourceType = FilterResourceType;
-
 RenderSVGResourceFilter::RenderSVGResourceFilter(SVGFilterElement* node)
     : RenderSVGResourceContainer(node)
 {
 }
 
 RenderSVGResourceFilter::~RenderSVGResourceFilter()
 {
 }
 
 void RenderSVGResourceFilter::destroy()
@@ skipping 243 matching lines @@
     markAllClientLayersForInvalidation();
 }
 
 FloatRect RenderSVGResourceFilter::drawingRegion(RenderObject* object) const
 {
     FilterData* filterData = m_filter.get(object);
     return filterData ? filterData->drawingRegion : FloatRect();
 }
 
 }