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

chromeos/network/network_device_handler_unittest.cc

 // Copyright 2013 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 "chromeos/network/network_device_handler.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/values.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/shill_device_client.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 
 namespace chromeos {
 
 namespace {
 
@@ skipping 280 matching lines @@
       kOldPin,
       kNewPin,
       GetErrorInvokingCallback(kDefaultCellularDevicePath,
                                "org.chromium.flimflam.Error.PinBlocked"),
       error_callback_);
   message_loop_.RunUntilIdle();
   EXPECT_EQ(NetworkDeviceHandler::kErrorPinBlocked, result_);
 }
 
 }  // namespace chromeos