Use isSVG*Element() helpers more in SVG code (Part 4)

Source/core/svg/SVGFilterPrimitiveStandardAttributes.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  *
  * 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 120 matching lines @@
         filterEffect->setHasHeight(true);
 }
 
 RenderObject* SVGFilterPrimitiveStandardAttributes::createRenderer(RenderStyle*)
 {
     return new RenderSVGResourceFilterPrimitive(this);
 }
 
 bool SVGFilterPrimitiveStandardAttributes::rendererIsNeeded(const RenderStyle& style)
 {
-    if (parentNode() && (parentNode()->hasTagName(SVGNames::filterTag)))
+    if (isSVGFilterElement(parentNode()))
         return SVGElement::rendererIsNeeded(style);
 
     return false;
 }
 
 void SVGFilterPrimitiveStandardAttributes::primitiveAttributeChanged(const QualifiedName& attribute)
 {
     if (RenderObject* primitiveRenderer = renderer())
         static_cast<RenderSVGResourceFilterPrimitive*>(primitiveRenderer)->primitiveAttributeChanged(attribute);
 }
 
 void invalidateFilterPrimitiveParent(SVGElement* element)
 {
     if (!element)
         return;
 
     ContainerNode* parent = element->parentNode();
 
     if (!parent)
         return;
 
     RenderObject* renderer = parent->renderer();
     if (!renderer || !renderer->isSVGResourceFilterPrimitive())
         return;
 
     RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer, false);
 }
 
 }