Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/modules/websockets/WebSocket.cpp

 /*
  * Copyright (C) 2011 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 233 matching lines @@
 PassRefPtr<WebSocket> WebSocket::create(ExecutionContext* context, const String& url, ExceptionState& exceptionState)
 {
     Vector<String> protocols;
     return create(context, url, protocols, exceptionState);
 }
 
 PassRefPtr<WebSocket> WebSocket::create(ExecutionContext* context, const String& url, const Vector<String>& protocols, ExceptionState& exceptionState)
 {
     if (url.isNull()) {
         exceptionState.throwDOMException(SyntaxError, "Failed to create a WebSocket: the provided URL is invalid.");
-        return 0;
+        return nullptr;
     }
 
     RefPtr<WebSocket> webSocket(adoptRef(new WebSocket(context)));
     webSocket->suspendIfNeeded();
 
     webSocket->connect(context->completeURL(url), protocols, exceptionState);
     if (exceptionState.hadException())
-        return 0;
+        return nullptr;
 
     return webSocket.release();
 }
 
 PassRefPtr<WebSocket> WebSocket::create(ExecutionContext* context, const String& url, const String& protocol, ExceptionState& exceptionState)
 {
     Vector<String> protocols;
     protocols.append(protocol);
     return create(context, url, protocols, exceptionState);
 }
@@ skipping 109 matching lines @@
     m_bufferedAmountAfterClose = saturateAdd(m_bufferedAmountAfterClose, payloadSize);
     m_bufferedAmountAfterClose = saturateAdd(m_bufferedAmountAfterClose, getFramingOverhead(payloadSize));
 
     logError("WebSocket is already in CLOSING or CLOSED state.");
 }
 
 void WebSocket::releaseChannel()
 {
     ASSERT(m_channel);
     m_channel->disconnect();
-    m_channel = 0;
+    m_channel = nullptr;
 }
 
 void WebSocket::send(const String& message, ExceptionState& exceptionState)
 {
     WTF_LOG(Network, "WebSocket %p send() Sending String '%s'", this, message.utf8().data());
     if (m_state == CONNECTING) {
         setInvalidStateErrorForSendMethod(exceptionState);
         return;
     }
     // No exception is raised if the connection was once established but has subsequently been closed.
@@ skipping 277 matching lines @@
     static const size_t minimumPayloadSizeWithEightByteExtendedPayloadLength = 0x10000;
     size_t overhead = hybiBaseFramingOverhead + hybiMaskingKeyLength;
     if (payloadSize >= minimumPayloadSizeWithEightByteExtendedPayloadLength)
         overhead += 8;
     else if (payloadSize >= minimumPayloadSizeWithTwoByteExtendedPayloadLength)
         overhead += 2;
     return overhead;
 }
 
 } // namespace WebCore