Use isSVG*Element() helpers more in SVG code (Part 3)

Source/core/rendering/svg/RenderSVGResourceFilterPrimitive.cpp

 /*
  * Copyright (C) 2010 University of Szeged
  * Copyright (C) 2010 Zoltan Herczeg
  * Copyright (C) 2011 Renata Hodovan (reni@webkit.org)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 26 matching lines @@
 
     RenderObject* filter = parent();
     if (!filter)
         return;
     ASSERT(filter->isSVGResourceFilter());
 
     if (diff == StyleDifferenceEqual || !oldStyle)
         return;
 
     const SVGRenderStyle* newStyle = this->style()->svgStyle();
-    if (element()->hasTagName(SVGNames::feFloodTag)) {
+    ASSERT(element());
+    if (isSVGFEFloodElement(*element())) {
         if (newStyle->floodColor() != oldStyle->svgStyle()->floodColor())
             toRenderSVGResourceFilter(filter)->primitiveAttributeChanged(this, SVGNames::flood_colorAttr);
         if (newStyle->floodOpacity() != oldStyle->svgStyle()->floodOpacity())
             toRenderSVGResourceFilter(filter)->primitiveAttributeChanged(this, SVGNames::flood_opacityAttr);
-    } else if (element()->hasTagName(SVGNames::feDiffuseLightingTag) || element()->hasTagName(SVGNames::feSpecularLightingTag)) {
+    } else if (isSVGFEDiffuseLightingElement(*element()) || isSVGFESpecularLightingElement(*element())) {
         if (newStyle->lightingColor() != oldStyle->svgStyle()->lightingColor())
             toRenderSVGResourceFilter(filter)->primitiveAttributeChanged(this, SVGNames::lighting_colorAttr);
     }
 }
 
 } // namespace WebCore