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

Source/core/layout/svg/LayoutSVGResourcePaintServer.cpp

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 101 matching lines @@
         }
     }
 
     // If the primary resource is just a color, return immediately.
     if (paintType < SVG_PAINTTYPE_URI_NONE) {
         // |paintType| will be either <current-color> or <rgb-color> here - both of which will have a color.
         ASSERT(hasColor);
         return SVGPaintDescription(color);
     }
 
-    LayoutSVGResourcePaintServer* uriResource = 0;
+    LayoutSVGResourcePaintServer* uriResource = nullptr;
     if (SVGResources* resources = SVGResourcesCache::cachedResourcesForLayoutObject(&object))
         uriResource = applyToFill ? resources->fill() : resources->stroke();
 
     // If the requested resource is not available, return the color resource or 'none'.
     if (!uriResource) {
         // The fallback is 'none'. (SVG2 say 'none' is implied when no fallback is specified.)
         if (paintType == SVG_PAINTTYPE_URI_NONE || !hasColor)
             return SVGPaintDescription();
 
         return SVGPaintDescription(color);
@@ skipping 38 matching lines @@
 LayoutSVGResourcePaintServer::~LayoutSVGResourcePaintServer()
 {
 }
 
 SVGPaintDescription LayoutSVGResourcePaintServer::requestPaintDescription(const LayoutObject& layoutObject, const ComputedStyle& style, LayoutSVGResourceMode resourceMode)
 {
     return requestPaint(layoutObject, style, resourceMode);
 }
 
 }