Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/svg/SVGGraphicsElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 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 40 matching lines @@
 }
 
 PassRefPtr<SVGMatrixTearOff> SVGGraphicsElement::getTransformToElement(SVGElement* target, ExceptionState& exceptionState)
 {
     AffineTransform ctm = getCTM(AllowStyleUpdate);
 
     if (target && target->isSVGGraphicsElement()) {
         AffineTransform targetCTM = toSVGGraphicsElement(target)->getCTM(AllowStyleUpdate);
         if (!targetCTM.isInvertible()) {
             exceptionState.throwDOMException(InvalidStateError, "The target transformation is not invertable.");
-            return 0;
+            return nullptr;
         }
         ctm = targetCTM.inverse() * ctm;
     }
 
     return SVGMatrixTearOff::create(ctm);
 }
 
 static AffineTransform computeCTM(SVGGraphicsElement* element, SVGElement::CTMScope mode, SVGGraphicsElement::StyleUpdateStrategy styleUpdateStrategy)
 {
     ASSERT(element);
@@ skipping 183 matching lines @@
 }
 
 void SVGGraphicsElement::toClipPath(Path& path)
 {
     updatePathFromGraphicsElement(this, path);
     // FIXME: How do we know the element has done a layout?
     path.transform(animatedLocalTransform());
 }
 
 }