C++11: Replace 0 with nullptr where applicable in layout code.

Source/core/layout/svg/LayoutSVGShape.h

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2006 Apple Computer, Inc
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) 2011 Renata Hodovan <reni@webkit.org>
  * Copyright (C) 2011 University of Szeged
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 52 matching lines @@
     }
     bool hasPath() const { return m_path.get(); }
 
     virtual bool isShapeEmpty() const { return path().isEmpty(); }
 
     bool hasNonScalingStroke() const { return style()->svgStyle().vectorEffect() == VE_NON_SCALING_STROKE; }
     Path* nonScalingStrokePath(const Path*, const AffineTransform&) const;
     AffineTransform nonScalingStrokeTransform() const;
     virtual AffineTransform localTransform() const override final { return m_localTransform ? *m_localTransform : LayoutSVGModelObject::localTransform(); }
 
-    virtual const Vector<MarkerPosition>* markerPositions() const { return 0; }
+    virtual const Vector<MarkerPosition>* markerPositions() const { return nullptr; }
 
     float strokeWidth() const;
 
     virtual ShapeGeometryCodePath geometryCodePath() const { return PathGeometry; }
-    virtual const Vector<FloatPoint>* zeroLengthLineCaps() const { return 0; }
+    virtual const Vector<FloatPoint>* zeroLengthLineCaps() const { return nullptr; }
 
     virtual FloatRect objectBoundingBox() const override final { return m_fillBoundingBox; }
 
     virtual const char* name() const override { return "LayoutSVGShape"; }
 
 protected:
     void clearPath() { m_path.clear(); }
     void createPath();
 
     virtual void updateShapeFromElement();
@@ skipping 35 matching lines @@
     bool m_needsBoundariesUpdate : 1;
     bool m_needsShapeUpdate : 1;
     bool m_needsTransformUpdate : 1;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutSVGShape, isSVGShape());
 
 }
 
 #endif