chrome: Cleanup class/struct forward declarations

chrome/browser/supervised_user/legacy/supervised_user_registration_utility.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 CHROME_BROWSER_SUPERVISED_USER_LEGACY_SUPERVISED_USER_REGISTRATION_UTILITY_H_
 #define CHROME_BROWSER_SUPERVISED_USER_LEGACY_SUPERVISED_USER_REGISTRATION_UTILITY_H_
 
 #include <map>
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "base/values.h"
 #include "chrome/browser/supervised_user/legacy/supervised_user_sync_service.h"
 #include "chrome/browser/supervised_user/legacy/supervised_user_sync_service_observer.h"
 #include "chrome/browser/supervised_user/supervised_users.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/prefs/pref_change_registrar.h"
 
 class GoogleServiceAuthError;
 class PrefService;
 class Profile;
 class SupervisedUserRefreshTokenFetcher;
 class SupervisedUserRegistrationUtilityTest;
 class SupervisedUserSharedSettingsService;
 
-namespace browser_sync {
-class DeviceInfo;
-}
-
 // Structure to store registration information.
 struct SupervisedUserRegistrationInfo {
   SupervisedUserRegistrationInfo(const base::string16& name, int avatar_index);
   ~SupervisedUserRegistrationInfo();
   int avatar_index;
   base::string16 name;
   std::string master_key;
   std::string password_signature_key;
   std::string password_encryption_key;
   base::DictionaryValue password_data;
@@ skipping 58 matching lines @@
 class ScopedTestingSupervisedUserRegistrationUtility {
  public:
   // Delegates ownership of the |instance| to SupervisedUserRegistrationUtility.
   ScopedTestingSupervisedUserRegistrationUtility(
       SupervisedUserRegistrationUtility* instance);
 
   ~ScopedTestingSupervisedUserRegistrationUtility();
 };
 
 #endif  // CHROME_BROWSER_SUPERVISED_USER_LEGACY_SUPERVISED_USER_REGISTRATION_UTILITY_H_