Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/platform/fonts/opentype/OpenTypeSanitizer.cpp

 /*
  * Copyright (C) 2009 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 23 matching lines @@
 #include "RuntimeEnabledFeatures.h"
 #include "platform/SharedBuffer.h"
 #include "opentype-sanitiser.h"
 #include "ots-memory-stream.h"
 
 namespace WebCore {
 
 PassRefPtr<SharedBuffer> OpenTypeSanitizer::sanitize()
 {
     if (!m_buffer)
-        return 0;
+        return nullptr;
 
     // This is the largest web font size which we'll try to transcode.
     static const size_t maxWebFontSize = 30 * 1024 * 1024; // 30 MB
     if (m_buffer->size() > maxWebFontSize)
-        return 0;
+        return nullptr;
 
     if (RuntimeEnabledFeatures::woff2Enabled())
         ots::EnableWOFF2();
 
     // A transcoded font is usually smaller than an original font.
     // However, it can be slightly bigger than the original one due to
     // name table replacement and/or padding for glyf table.
     //
     // With WOFF fonts, however, we'll be decompressing, so the result can be
     // much larger than the original.
 
     ots::ExpandingMemoryStream output(m_buffer->size(), maxWebFontSize);
     if (!ots::Process(&output, reinterpret_cast<const uint8_t*>(m_buffer->data()), m_buffer->size()))
-        return 0;
+        return nullptr;
 
     const size_t transcodeLen = output.Tell();
     return SharedBuffer::create(static_cast<unsigned char*>(output.get()), transcodeLen);
 }
 
 bool OpenTypeSanitizer::supportsFormat(const String& format)
 {
     return equalIgnoringCase(format, "woff")
         || (RuntimeEnabledFeatures::woff2Enabled() && equalIgnoringCase(format, "woff2"));
 }
 
 } // namespace WebCore