Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/svg/SVGTransform.cpp

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 56 matching lines @@
 
 PassRefPtr<SVGTransform> SVGTransform::clone() const
 {
     return adoptRef(new SVGTransform(m_transformType, m_angle, m_center, m_matrix));
 }
 
 PassRefPtr<NewSVGPropertyBase> SVGTransform::cloneForAnimation(const String&) const
 {
     // SVGTransform is never animated.
     ASSERT_NOT_REACHED();
-    return 0;
+    return nullptr;
 }
 
 void SVGTransform::setMatrix(const AffineTransform& matrix)
 {
     onMatrixChange();
     m_matrix = matrix;
 }
 
 void SVGTransform::onMatrixChange()
 {
@@ skipping 150 matching lines @@
 
 float SVGTransform::calculateDistance(PassRefPtr<NewSVGPropertyBase>, SVGElement*)
 {
     // SVGTransform is not animated by itself.
     ASSERT_NOT_REACHED();
 
     return -1;
 }
 
 } // namespace WebCore