Do not use empty callback when cleaning up managed users

chrome/browser/chromeos/login/user_manager_impl.cc

Index: chrome/browser/chromeos/login/user_manager_impl.cc
diff --git a/chrome/browser/chromeos/login/user_manager_impl.cc b/chrome/browser/chromeos/login/user_manager_impl.cc
index b82a92c992a559db6f825227f2bebac0fa01caf8..7f1d22a6bde2e44e27ec7ca19ac57053ff5dbb6b 100644
--- a/chrome/browser/chromeos/login/user_manager_impl.cc
+++ b/chrome/browser/chromeos/login/user_manager_impl.cc
@@ -1418,7 +1418,7 @@ void UserManagerImpl::RollbackLocallyManagedUserCreationTransaction() {
   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);