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

chromeos/dbus/cryptohome_client.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 "chromeos/dbus/cryptohome_client.h"
 
 #include "base/bind.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "chromeos/cryptohome/async_method_caller.h"
 #include "chromeos/dbus/blocking_method_caller.h"
 #include "dbus/bus.h"
 #include "dbus/message.h"
 #include "dbus/object_path.h"
 #include "dbus/object_proxy.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 
 namespace chromeos {
 
@@ skipping 1204 matching lines @@
   return new CryptohomeClientStubImpl();
 }
 
 // static
 std::string CryptohomeClient::GetStubSanitizedUsername(
     const std::string& username) {
   return username + kUserIdStubHashSuffix;
 }
 
 }  // namespace chromeos