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

Source/core/svg/SVGLinearGradientElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 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 152 matching lines @@
         if (refNode && isSVGGradientElement(*refNode)) {
             current = toSVGGradientElement(refNode);
 
             // Cycle detection
             if (processedGradients.contains(current))
                 return true;
 
             if (!current->renderer())
                 return false;
 
-            setGradientAttributes(current, attributes, current->hasTagName(SVGNames::linearGradientTag));
+            setGradientAttributes(current, attributes, isSVGLinearGradientElement(*current));
             processedGradients.add(current);
         } else {
             return true;
         }
     }
 
     ASSERT_NOT_REACHED();
     return false;
 }
 
 bool SVGLinearGradientElement::selfHasRelativeLengths() const
 {
     return m_x1->currentValue()->isRelative()
         || m_y1->currentValue()->isRelative()
         || m_x2->currentValue()->isRelative()
         || m_y2->currentValue()->isRelative();
 }
 
 }