remoting: convert another unittest MessageLoop to MessageLoopForIO

remoting/protocol/ssl_hmac_channel_authenticator_unittest.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/file_path.h"
 #include "base/file_util.h"
 #include "base/message_loop.h"
@@ skipping 86 matching lines @@
     host_callback_.OnDone(error, socket.get());
     host_socket_ = socket.Pass();
   }
 
   void OnClientConnected(net::Error error,
                          scoped_ptr<net::StreamSocket> socket) {
     client_callback_.OnDone(error, socket.get());
     client_socket_ = socket.Pass();
   }
 
-  MessageLoop message_loop_;
+  MessageLoopForIO message_loop_;
 
   scoped_ptr<crypto::RSAPrivateKey> private_key_;
   std::string host_cert_;
   scoped_ptr<FakeSocket> client_fake_socket_;
   scoped_ptr<FakeSocket> host_fake_socket_;
   scoped_ptr<ChannelAuthenticator> client_auth_;
   scoped_ptr<ChannelAuthenticator> host_auth_;
   MockChannelDoneCallback client_callback_;
   MockChannelDoneCallback host_callback_;
   scoped_ptr<net::StreamSocket> client_socket_;
@@ skipping 29 matching lines @@
   host_auth_ = SslHmacChannelAuthenticator::CreateForHost(
       host_cert_, private_key_.get(), kTestSharedSecret);
 
   RunChannelAuth(true);
 
   EXPECT_TRUE(host_socket_.get() == NULL);
 }
 
 }  // namespace protocol
 }  // namespace remoting