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

Source/core/layout/svg/SVGLayoutSupport.h

 /**
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * 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
@@ skipping 56 matching lines @@
     // Transform |pointInParent| to |object|'s user-space and check if it is
     // within the clipping area. Returns false if the transform is singular or
     // the point is outside the clipping area.
     static bool transformToUserSpaceAndCheckClipping(LayoutObject*, const AffineTransform& localTransform, const FloatPoint& pointInParent, FloatPoint& localPoint);
 
     static void computeContainerBoundingBoxes(const LayoutObject* container, FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, FloatRect& strokeBoundingBox, FloatRect& paintInvalidationBoundingBox);
 
     // Important functions used by nearly all SVG layoutObjects centralizing coordinate transformations / paint invalidation rect calculations
     static LayoutRect clippedOverflowRectForPaintInvalidation(const LayoutObject&, const LayoutBoxModelObject* paintInvalidationContainer, const PaintInvalidationState*);
     static const LayoutSVGRoot& mapRectToSVGRootForPaintInvalidation(const LayoutObject&, const FloatRect& localPaintInvalidationRect, LayoutRect&);
-    static void mapLocalToContainer(const LayoutObject*, const LayoutBoxModelObject* paintInvalidationContainer, TransformState&, bool* wasFixed = 0, const PaintInvalidationState* = 0);
+    static void mapLocalToContainer(const LayoutObject*, const LayoutBoxModelObject* paintInvalidationContainer, TransformState&, bool* wasFixed = nullptr, const PaintInvalidationState* = nullptr);
     static const LayoutObject* pushMappingToContainer(const LayoutObject*, const LayoutBoxModelObject* ancestorToStopAt, LayoutGeometryMap&);
 
     // Shared between SVG layoutObjects and resources.
     static void applyStrokeStyleToStrokeData(StrokeData&, const ComputedStyle&, const LayoutObject&);
 
     static DashArray resolveSVGDashArray(const SVGDashArray&, const ComputedStyle&, const SVGLengthContext&);
 
     // Determines if any ancestor's transform has changed.
     static bool transformToRootChanged(LayoutObject*);
 
@@ skipping 36 matching lines @@
             return true;
         if (child->hasNonIsolatedBlendingDescendants() && !willIsolateBlendingDescendantsForObject(child))
             return true;
     }
     return false;
 }
 
 } // namespace blink
 
 #endif // SVGLayoutSupport_h