Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/wtf/TypedArrayBase.h

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * Copyright (c) 2010, Google 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
@@ skipping 75 matching lines @@
         : ArrayBufferView(buffer, byteOffset)
         , m_length(length)
     {
     }
 
     template <class Subclass>
     static PassRefPtr<Subclass> create(unsigned length)
     {
         RefPtr<ArrayBuffer> buffer = ArrayBuffer::create(length, sizeof(T));
         if (!buffer.get())
-            return 0;
+            return nullptr;
         return create<Subclass>(buffer, 0, length);
     }
 
     template <class Subclass>
     static PassRefPtr<Subclass> create(const T* array, unsigned length)
     {
         RefPtr<Subclass> a = create<Subclass>(length);
         if (a)
             for (unsigned i = 0; i < length; ++i)
                 a->set(i, array[i]);
         return a;
     }
 
     template <class Subclass>
     static PassRefPtr<Subclass> create(PassRefPtr<ArrayBuffer> buffer,
                                        unsigned byteOffset,
                                        unsigned length)
     {
         RefPtr<ArrayBuffer> buf(buffer);
         if (!verifySubRange<T>(buf, byteOffset, length))
-            return 0;
+            return nullptr;
 
         return adoptRef(new Subclass(buf, byteOffset, length));
     }
 
     template <class Subclass>
     static PassRefPtr<Subclass> createUninitialized(unsigned length)
     {
         RefPtr<ArrayBuffer> buffer = ArrayBuffer::createUninitialized(length, sizeof(T));
         if (!buffer.get())
-            return 0;
+            return nullptr;
         return create<Subclass>(buffer, 0, length);
     }
 
     template <class Subclass>
     PassRefPtr<Subclass> subarrayImpl(int start, int end) const
     {
         unsigned offset, length;
         calculateOffsetAndLength(start, end, m_length, &offset, &length);
         clampOffsetAndNumElements<T>(buffer(), m_byteOffset, &offset, &length);
         return create<Subclass>(buffer(), offset, length);
     }
 
     virtual void neuter() OVERRIDE FINAL
     {
         ArrayBufferView::neuter();
         m_length = 0;
     }
 
     // We do not want to have to access this via a virtual function in subclasses,
     // which is why it is protected rather than private.
     unsigned m_length;
 };
 
 } // namespace WTF
 
 using WTF::TypedArrayBase;
 
 #endif // TypedArrayBase_h