We should use UserID object to identify users instead of username.

chromeos/login/auth/online_attempt.cc

 // 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.
 
 #include "chromeos/login/auth/online_attempt.h"
 
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
@@ skipping 97 matching lines @@
   TriggerResolve(AuthFailure::FromNetworkAuthFailure(error));
 }
 
 void OnlineAttempt::TryClientLogin() {
   message_loop_->PostDelayedTask(
       FROM_HERE,
       base::Bind(&OnlineAttempt::CancelClientLogin, weak_factory_.GetWeakPtr()),
       base::TimeDelta::FromMilliseconds(kClientLoginTimeoutMs));
 
   client_fetcher_->StartClientLogin(
-      attempt_->user_context.GetUserID(),
+      attempt_->user_context.GetUserID().GetUserEmail(),
       attempt_->user_context.GetKey()->GetSecret(),
       GaiaConstants::kSyncService,
       attempt_->login_token,
       attempt_->login_captcha,
       attempt_->hosted_policy());
 }
 
 bool OnlineAttempt::HasPendingFetch() {
   return client_fetcher_->HasPendingFetch();
 }
@@ skipping 11 matching lines @@
   }
 }
 
 void OnlineAttempt::TriggerResolve(const AuthFailure& outcome) {
   attempt_->RecordOnlineLoginStatus(outcome);
   client_fetcher_.reset(NULL);
   resolver_->Resolve();
 }
 
 }  // namespace chromeos