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

Source/core/layout/svg/LayoutSVGResourceContainer.h

 /*
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 46 matching lines @@
         return resourceType == PatternResourceType
             || resourceType == LinearGradientResourceType
             || resourceType == RadialGradientResourceType;
     }
 
     void idChanged();
     void addClientLayer(Node*);
     void addClientLayer(DeprecatedPaintLayer*);
     void removeClientLayer(DeprecatedPaintLayer*);
 
-    void invalidateCacheAndMarkForLayout(SubtreeLayoutScope* = 0);
+    void invalidateCacheAndMarkForLayout(SubtreeLayoutScope* = nullptr);
 
     static void markForLayoutAndParentResourceInvalidation(LayoutObject*, bool needsLayout = true);
 
     void clearInvalidationMask() { m_invalidationMask = 0; }
 
 protected:
     // When adding modes, make sure we don't overflow m_invalidationMask below.
     enum InvalidationMode {
         LayoutAndBoundariesInvalidation = 1 << 0,
         BoundariesInvalidation = 1 << 1,
@@ skipping 25 matching lines @@
     unsigned m_isInvalidating : 1;
     // 22 padding bits available
 
     HashSet<LayoutObject*> m_clients;
     HashSet<DeprecatedPaintLayer*> m_clientLayers;
 };
 
 inline LayoutSVGResourceContainer* getLayoutSVGResourceContainerById(TreeScope& treeScope, const AtomicString& id)
 {
     if (id.isEmpty())
-        return 0;
+        return nullptr;
 
     if (LayoutSVGResourceContainer* layoutResource = treeScope.document().accessSVGExtensions().resourceById(id))
         return layoutResource;
 
-    return 0;
+    return nullptr;
 }
 
 template<typename Layout>
 Layout* getLayoutSVGResourceById(TreeScope& treeScope, const AtomicString& id)
 {
     if (LayoutSVGResourceContainer* container = getLayoutSVGResourceContainerById(treeScope, id)) {
         if (container->resourceType() == Layout::s_resourceType)
             return static_cast<Layout*>(container);
     }
-    return 0;
+    return nullptr;
 }
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutSVGResourceContainer, isSVGResourceContainer());
 
 #define DEFINE_LAYOUT_SVG_RESOURCE_TYPE_CASTS(thisType, typeName) \
     DEFINE_TYPE_CASTS(thisType, LayoutSVGResourceContainer, resource, resource->resourceType() == typeName, resource.resourceType() == typeName)
 
 }
 
 #endif