This CL clean up patch in SVGElements.

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>
  * Copyright (C) 2014 Google, Inc.
  *
  * 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.
  *
@@ skipping 199 matching lines @@
     SVGElement::svgAttributeChanged(attrName);
 }
 
 SVGElement* SVGGraphicsElement::nearestViewportElement() const
 {
     for (Element* current = parentOrShadowHostElement(); current; current = current->parentOrShadowHostElement()) {
         if (isViewportElement(*current))
             return toSVGElement(current);
     }
 
-    return 0;
+    return nullptr;
 }
 
 SVGElement* SVGGraphicsElement::farthestViewportElement() const
 {
     SVGElement* farthest = 0;
     for (Element* current = parentOrShadowHostElement(); current; current = current->parentOrShadowHostElement()) {
         if (isViewportElement(*current))
             farthest = toSVGElement(current);
     }
     return farthest;
@@ skipping 21 matching lines @@
     return new LayoutSVGPath(this);
 }
 
 void SVGGraphicsElement::toClipPath(Path& path)
 {
     updatePathFromGraphicsElement(this, path);
     path.transform(calculateAnimatedLocalTransform());
 }
 
 }