Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/fileapi/FileReaderLoader.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 117 matching lines @@
 
 void FileReaderLoader::start(ExecutionContext* executionContext, const Stream& stream, unsigned readSize)
 {
     if (readSize > 0) {
         m_hasRange = true;
         m_rangeStart = 0;
         m_rangeEnd = readSize - 1; // End is inclusive so (0,0) is a 1-byte read.
     }
 
     m_urlForReadingIsStream = true;
-    startInternal(executionContext, &stream, 0);
+    startInternal(executionContext, &stream, nullptr);
 }
 
 void FileReaderLoader::cancel()
 {
     m_errorCode = FileError::ABORT_ERR;
     terminate();
 }
 
 void FileReaderLoader::terminate()
 {
     if (m_loader) {
         m_loader->cancel();
         cleanup();
     }
 }
 
 void FileReaderLoader::cleanup()
 {
-    m_loader = 0;
+    m_loader = nullptr;
 
     // If we get any error, we do not need to keep a buffer around.
     if (m_errorCode) {
         m_rawData.clear();
         m_stringResult = "";
         m_isRawDataConverted = true;
         m_decoder.clear();
     }
 }
 
@@ skipping 129 matching lines @@
         return FileError::NOT_READABLE_ERR;
     }
 }
 
 PassRefPtr<ArrayBuffer> FileReaderLoader::arrayBufferResult() const
 {
     ASSERT(m_readType == ReadAsArrayBuffer);
 
     // If the loading is not started or an error occurs, return an empty result.
     if (!m_rawData || m_errorCode)
-        return 0;
+        return nullptr;
 
     return m_rawData->toArrayBuffer();
 }
 
 String FileReaderLoader::stringResult()
 {
     ASSERT(m_readType != ReadAsArrayBuffer && m_readType != ReadAsBlob && m_readType != ReadByClient);
 
     // If the loading is not started or an error occurs, return an empty result.
     if (!m_rawData || m_errorCode)
@@ skipping 74 matching lines @@
     m_stringResult = builder.toString();
 }
 
 void FileReaderLoader::setEncoding(const String& encoding)
 {
     if (!encoding.isEmpty())
         m_encoding = WTF::TextEncoding(encoding);
 }
 
 } // namespace WebCore