Disallow C++11 compilers from constructing OwnPtrs from 0

Source/wtf/OwnPtr.h

 /*
  *  Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. 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 24 matching lines @@
 
     template<typename T> class PassOwnPtr;
     template<typename T> PassOwnPtr<T> adoptPtr(T*);
 
     template<typename T> class OwnPtr {
 #if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
         // If rvalue references are not supported, the copy constructor is
         // public so OwnPtr cannot be marked noncopyable. See note below.
         WTF_MAKE_NONCOPYABLE(OwnPtr);
 #endif
+        WTF_DISALLOW_CONSTRUCTION_FROM_ZERO(OwnPtr);
     public:
         typedef typename RemovePointer<T>::Type ValueType;
         typedef ValueType* PtrType;
 
         OwnPtr() : m_ptr(0) { }
         OwnPtr(std::nullptr_t) : m_ptr(0) { }
 
         // See comment in PassOwnPtr.h for why this takes a const reference.
         template<typename U> OwnPtr(const PassOwnPtr<U>& o);
 
@@ skipping 156 matching lines @@
     template<typename T> inline typename OwnPtr<T>::PtrType getPtr(const OwnPtr<T>& p)
     {
         return p.get();
     }
 
 } // namespace WTF
 
 using WTF::OwnPtr;
 
 #endif // WTF_OwnPtr_h