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

remoting/protocol/channel_multiplexer_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/channel_multiplexer.h"
 
 #include "base/bind.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "net/base/net_errors.h"
 #include "net/socket/socket.h"
 #include "net/socket/stream_socket.h"
 #include "remoting/base/constants.h"
 #include "remoting/protocol/connection_tester.h"
 #include "remoting/protocol/fake_session.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using testing::_;
@@ skipping 345 matching lines @@
       .WillOnce(InvokeWithoutArgs(
           this, &ChannelMultiplexerTest::DeleteAfterSessionFail));
   EXPECT_CALL(cb2, OnConnectedPtr(_))
       .Times(0);
 
   message_loop_.RunUntilIdle();
 }
 
 }  // namespace protocol
 }  // namespace remoting