Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/svg/SVGViewSpec.cpp

 /*
  * Copyright (C) 2007, 2010 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 58 matching lines @@
     if (!m_contextElement)
         return 0;
     Element* element = m_contextElement->treeScope().getElementById(AtomicString(m_viewTargetString));
     if (!element || !element->isSVGElement())
         return 0;
     return toSVGElement(element);
 }
 
 void SVGViewSpec::detachContextElement()
 {
-    m_transform = 0;
+    m_transform = nullptr;
     clearViewBox();
     clearPreserveAspectRatio();
     m_contextElement = 0;
 }
 
 void SVGViewSpec::reset()
 {
     resetZoomAndPan();
     m_transform->baseValue()->clear();
     updateViewBox(FloatRect());
@@ skipping 101 matching lines @@
         const LChar* ptr = spec.characters8();
         const LChar* end = ptr + spec.length();
         return parseViewSpecInternal(ptr, end);
     }
     const UChar* ptr = spec.characters16();
     const UChar* end = ptr + spec.length();
     return parseViewSpecInternal(ptr, end);
 }
 
 }