Clean up static_cast<SVGFooElement*> by using toSVGFoo()

Source/core/svg/SVGAnimatedTransformList.cpp

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2012. 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 16 matching lines @@
 
 #include "SVGNames.h"
 #include "core/svg/SVGAnimateTransformElement.h"
 #include "core/svg/SVGAnimatedNumber.h"
 #include "core/svg/SVGTransformDistance.h"
 
 namespace WebCore {
 
 SVGAnimatedTransformListAnimator::SVGAnimatedTransformListAnimator(SVGAnimationElement* animationElement, SVGElement* contextElement)
     : SVGAnimatedTypeAnimator(AnimatedTransformList, animationElement, contextElement)
-    , m_transformTypeString(SVGTransform::transformTypePrefixForParsing(static_cast<SVGAnimateTransformElement*>(animationElement)->transformType()))
+    , m_transformTypeString(SVGTransform::transformTypePrefixForParsing(toSVGAnimateTransformElement(animationElement)->transformType()))
 {
     // Only <animateTransform> uses this animator, as <animate> doesn't allow to animate transform lists directly.
     ASSERT(animationElement->hasTagName(SVGNames::animateTransformTag));
 }
 
 PassOwnPtr<SVGAnimatedType> SVGAnimatedTransformListAnimator::constructFromString(const String& string)
 {
     OwnPtr<SVGAnimatedType> animatedType = SVGAnimatedType::createTransformList(new SVGTransformList);
     animatedType->transformList().parse(m_transformTypeString + string + ')');
     ASSERT(animatedType->transformList().size() <= 1);
@@ skipping 95 matching lines @@
     if (fromTransformList[0].type() != toTransformList[0].type())
         return -1;
 
     // Spec: http://www.w3.org/TR/SVG/animate.html#complexDistances
     // Paced animations assume a notion of distance between the various animation values defined by the ‘to’, ‘from’, ‘by’ and ‘values’ attributes.
     // Distance is defined only for scalar types (such as <length>), colors and the subset of transformation types that are supported by ‘animateTransform’.
     return SVGTransformDistance(fromTransformList[0], toTransformList[0]).distance();
 }
 
 }