Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/html/canvas/DataView.cpp

 /*
  * 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 29 matching lines @@
 };
 
 }
 
 namespace WebCore {
 
 PassRefPtr<DataView> DataView::create(unsigned length)
 {
     RefPtr<ArrayBuffer> buffer = ArrayBuffer::create(length, sizeof(uint8_t));
     if (!buffer.get())
-        return 0;
+        return nullptr;
     return create(buffer, 0, length);
 }
 
 PassRefPtr<DataView> DataView::create(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned byteLength)
 {
     if (byteOffset > buffer->byteLength())
-        return 0;
+        return nullptr;
     CheckedInt<uint32_t> checkedOffset(byteOffset);
     CheckedInt<uint32_t> checkedLength(byteLength);
     CheckedInt<uint32_t> checkedMax = checkedOffset + checkedLength;
     if (!checkedMax.isValid() || checkedMax.value() > buffer->byteLength())
-        return 0;
+        return nullptr;
     return adoptRef(new DataView(buffer, byteOffset, byteLength));
 }
 
 DataView::DataView(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned byteLength)
     : ArrayBufferView(buffer, byteOffset)
     , m_byteLength(byteLength)
 {
     ScriptWrappable::init(this);
 }
 
@@ skipping 166 matching lines @@
     setData<double>(byteOffset, value, littleEndian, exceptionState);
 }
 
 void DataView::neuter()
 {
     ArrayBufferView::neuter();
     m_byteLength = 0;
 }
 
 }