Use a direct include of the message_loop header in remoting/.

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/base64.h"
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/test/test_timeouts.h"
 #include "base/timer/timer.h"
 #include "crypto/rsa_private_key.h"
 #include "net/base/net_errors.h"
 #include "net/base/test_data_directory.h"
 #include "remoting/base/rsa_key_pair.h"
 #include "remoting/protocol/connection_tester.h"
 #include "remoting/protocol/fake_session.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 142 matching lines @@
   host_auth_ = SslHmacChannelAuthenticator::CreateForHost(
       host_cert_, key_pair_, kTestSharedSecret);
 
   RunChannelAuth(true);
 
   ASSERT_TRUE(host_socket_.get() == NULL);
 }
 
 }  // namespace protocol
 }  // namespace remoting