Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/modules/websockets/MainThreadWebSocketChannel.cpp

 /*
  * Copyright (C) 2011, 2012 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 273 matching lines @@
     m_state = ChannelClosed;
     if (m_closingTimer.isActive())
         m_closingTimer.stop();
     if (m_outgoingFrameQueueStatus != OutgoingFrameQueueClosed)
         abortOutgoingFrameQueue();
     if (m_handle) {
         m_unhandledBufferedAmount = m_handle->bufferedAmount();
         WebSocketChannelClient* client = m_client;
         m_client = 0;
         clearDocument();
-        m_handle = 0;
+        m_handle = nullptr;
         if (client)
             client->didClose(m_unhandledBufferedAmount, m_receivedClosingHandshake ? WebSocketChannelClient::ClosingHandshakeComplete : WebSocketChannelClient::ClosingHandshakeIncomplete, m_closeEventCode, m_closeEventReason);
     }
     deref();
 }
 
 void MainThreadWebSocketChannel::didReceiveSocketStreamData(SocketStreamHandle* handle, const char* data, int len)
 {
     WTF_LOG(Network, "MainThreadWebSocketChannel %p didReceiveSocketStreamData() Received %d bytes", this, len);
     RefPtr<MainThreadWebSocketChannel> protect(this); // The client can close the channel, potentially removing the last reference.
@@ skipping 517 matching lines @@
     }
 
     Vector<char> frameData;
     frame.makeFrameData(frameData);
 
     m_perMessageDeflate.resetDeflateBuffer();
     return m_handle->send(frameData.data(), frameData.size());
 }
 
 } // namespace WebCore