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

Source/core/layout/svg/LayoutSVGInline.h

 /*
  * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
  * Copyright (C) 2006 Apple Computer 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 26 matching lines @@
 
     // Chapter 10.4 of the SVG Specification say that we should use the
     // object bounding box of the parent text element.
     // We search for the root text element and take its bounding box.
     // It is also necessary to take the stroke and paint invalidation rect of
     // this element, since we need it for filters.
     virtual FloatRect objectBoundingBox() const override final;
     virtual FloatRect strokeBoundingBox() const override final;
     virtual FloatRect paintInvalidationRectInLocalCoordinates() const override final;
 
-    virtual LayoutRect clippedOverflowRectForPaintInvalidation(const LayoutBoxModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const override final;
-    virtual void mapLocalToContainer(const LayoutBoxModelObject* paintInvalidationContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = 0, const PaintInvalidationState* = 0) const override final;
+    virtual LayoutRect clippedOverflowRectForPaintInvalidation(const LayoutBoxModelObject* paintInvalidationContainer, const PaintInvalidationState* = nullptr) const override final;
+    virtual void mapLocalToContainer(const LayoutBoxModelObject* paintInvalidationContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = nullptr, const PaintInvalidationState* = nullptr) const override final;
     virtual const LayoutObject* pushMappingToContainer(const LayoutBoxModelObject* ancestorToStopAt, LayoutGeometryMap&) const override final;
     virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const override final;
 
 private:
     virtual InlineFlowBox* createInlineFlowBox() override final;
 
     virtual void willBeDestroyed() override final;
     virtual void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override final;
 
-    virtual void addChild(LayoutObject* child, LayoutObject* beforeChild = 0) override final;
+    virtual void addChild(LayoutObject* child, LayoutObject* beforeChild = nullptr) override final;
     virtual void removeChild(LayoutObject*) override final;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutSVGInline, isSVGInline());
 
 }
 
 #endif // LayoutSVGInline_H