Use C++11 features in core/html

Source/core/html/canvas/WebGLObject.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 71 matching lines @@
     // With Oilpan enabled, objects may end up being finalized without
     // having been detached first. Consequently, the objects force
     // detachment first before deleting the platform object. Without
     // Oilpan, the objects will have been detached from the 'parent'
     // objects first and do not separately require it when finalizing.
     //
     // However, as detach() is trivial, the individual WebGL
     // destructors will always call detachAndDeleteObject() rather
     // than do it based on Oilpan being enabled.
     detach();
-    deleteObject(0);
+    deleteObject(nullptr);
 }
 
 void WebGLObject::onDetached(blink::WebGraphicsContext3D* context3d)
 {
     if (m_attachmentCount)
         --m_attachmentCount;
     if (m_deleted)
         deleteObject(context3d);
 }
 
 }