Do not use empty callback when cleaning up managed users

chrome/browser/chromeos/login/user_manager_impl.cc

 // Copyright (c) 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 "chrome/browser/chromeos/login/user_manager_impl.h"
 
 #include <cstddef>
 #include <set>
 
 #include "ash/shell.h"
@@ skipping 1400 matching lines @@
     prefs->ClearPref(kLocallyManagedUserCreationTransactionUserId);
     return;
   }
 
   ListPrefUpdate prefs_users_update(prefs, kRegularUsers);
   prefs_users_update->Remove(base::StringValue(user_id), NULL);
 
   RemoveNonCryptohomeData(user_id);
 
   cryptohome::AsyncMethodCaller::GetInstance()->AsyncRemove(
-      user_id, base::Callback<void(bool, cryptohome::MountError)>());
+      user_id, base::Bind(&OnRemoveUserComplete, user_id));
 
   prefs->ClearPref(kLocallyManagedUserCreationTransactionDisplayName);
   prefs->ClearPref(kLocallyManagedUserCreationTransactionUserId);
   prefs->CommitPendingWrite();
 }
 
 UserFlow* UserManagerImpl::GetCurrentUserFlow() const {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (!IsUserLoggedIn())
     return GetDefaultUserFlow();
@@ skipping 116 matching lines @@
   // TODO(nkostylev): Restore all user sessions (in the background).
   // This requires first refactoring this flow out of LoginUtils.
   // 1. UserManager::UserLoggedIn()
   // 2. InitSessionRestoreStrategy() (OAuth)
   // 2. ProfileManager::CreateDefaultProfileAsync()
   // 3. InitProfilePreferences
   // 4. chrome::NOTIFICATION_LOGIN_USER_PROFILE_PREPARED
 }
 
 }  // namespace chromeos