Rewrite scoped_ptr<T>(NULL) to use the default ctor in remoting/.

remoting/protocol/ssl_hmac_channel_authenticator.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/protocol/ssl_hmac_channel_authenticator.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "crypto/secure_util.h"
 #include "net/base/host_port_pair.h"
@@ skipping 248 matching lines @@
   if (auth_write_buf_.get() == NULL && auth_read_buf_.get() == NULL) {
     DCHECK(socket_.get() != NULL);
     if (callback_called)
       *callback_called = true;
     done_callback_.Run(net::OK, socket_.PassAs<net::StreamSocket>());
   }
 }
 
 void SslHmacChannelAuthenticator::NotifyError(int error) {
   done_callback_.Run(static_cast<net::Error>(error),
-                     scoped_ptr<net::StreamSocket>(NULL));
+                     scoped_ptr<net::StreamSocket>());
 }
 
 }  // namespace protocol
 }  // namespace remoting