Use isSVG*Element() helpers more in SVG code (Part 1)

Source/core/svg/SVGFELightElement.h

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Oliver Hunt <oliver@nerget.com>
  *
  * 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 14 matching lines @@
 #include "SVGNames.h"
 #include "core/svg/SVGAnimatedNumber.h"
 #include "core/svg/SVGElement.h"
 #include "platform/graphics/filters/LightSource.h"
 
 namespace WebCore {
 
 class SVGFELightElement : public SVGElement {
 public:
     virtual PassRefPtr<LightSource> lightSource() const = 0;
-    static SVGFELightElement* findLightElement(const SVGElement*);
-    static PassRefPtr<LightSource> findLightSource(const SVGElement*);
+    static SVGFELightElement* findLightElement(const SVGElement&);
+    static PassRefPtr<LightSource> findLightSource(const SVGElement&);
 
     SVGAnimatedNumber* azimuth() { return m_azimuth.get(); }
     const SVGAnimatedNumber* azimuth() const { return m_azimuth.get(); }
     SVGAnimatedNumber* elevation() { return m_elevation.get(); }
     const SVGAnimatedNumber* elevation() const { return m_elevation.get(); }
     SVGAnimatedNumber* x() { return m_x.get(); }
     const SVGAnimatedNumber* x() const { return m_x.get(); }
     SVGAnimatedNumber* y() { return m_y.get(); }
     const SVGAnimatedNumber* y() const { return m_y.get(); }
     SVGAnimatedNumber* z() { return m_z.get(); }
@@ skipping 35 matching lines @@
 inline bool isSVGFELightElement(const Node& node)
 {
     return node.hasTagName(SVGNames::feDistantLightTag) || node.hasTagName(SVGNames::fePointLightTag) || node.hasTagName(SVGNames::feSpotLightTag);
 }
 
 DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(SVGFELightElement);
 
 } // namespace WebCore
 
 #endif