Cleanup usage of scoped_ptr<> in remoting for C++11

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 262 matching lines @@
   return crypto::SecureMemEqual(received_auth_bytes.data(),
                                 &(auth_bytes[0]), kAuthDigestLength);
 }
 
 void SslHmacChannelAuthenticator::CheckDone(bool* callback_called) {
   if (auth_write_buf_.get() == NULL && auth_read_buf_.get() == NULL) {
     DCHECK(socket_.get() != NULL);
     if (callback_called)
       *callback_called = true;
 
-    CallDoneCallback(net::OK, socket_.PassAs<net::StreamSocket>());
+    CallDoneCallback(net::OK, socket_.Pass());
   }
 }
 
 void SslHmacChannelAuthenticator::NotifyError(int error) {
-  CallDoneCallback(error, scoped_ptr<net::StreamSocket>());
+  CallDoneCallback(error, nullptr);
 }
 
 void SslHmacChannelAuthenticator::CallDoneCallback(
     int error,
     scoped_ptr<net::StreamSocket> socket) {
   DoneCallback callback = done_callback_;
   done_callback_.Reset();
   callback.Run(error, socket.Pass());
 }
 
 }  // namespace protocol
 }  // namespace remoting