Revert of base: Remove use of MessageLoopProxy

chromeos/login/auth/online_attempt.h

 // Copyright 2014 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.
 
 #ifndef CHROMEOS_LOGIN_AUTH_ONLINE_ATTEMPT_H_
 #define CHROMEOS_LOGIN_AUTH_ONLINE_ATTEMPT_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "chromeos/chromeos_export.h"
 #include "chromeos/login/auth/auth_status_consumer.h"
 #include "google_apis/gaia/gaia_auth_consumer.h"
 #include "google_apis/gaia/google_service_auth_error.h"
 
 class GaiaAuthFetcher;
 
-namespace base {
-// TODO(skyostil): Migrate to SingleThreadTaskRunner (crbug.com/465354).
-class MessageLoopProxy;
-}
-
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace chromeos {
 class AuthAttemptState;
 class AuthAttemptStateResolver;
 
 class CHROMEOS_EXPORT OnlineAttempt : public GaiaAuthConsumer {
  public:
@@ skipping 41 matching lines @@
   // Used to cancel the CancelClientLogin closure.
   base::WeakPtrFactory<OnlineAttempt> weak_factory_;
 
   friend class OnlineAttemptTest;
   DISALLOW_COPY_AND_ASSIGN(OnlineAttempt);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_LOGIN_AUTH_ONLINE_ATTEMPT_H_