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

chrome/browser/chromeos/login/app_launch_controller.cc

 // Copyright 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/app_launch_controller.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/json/json_file_value_serializer.h"
@@ skipping 304 matching lines @@
     if (CrosSettings::Get()->GetBoolean(
             kAccountsPrefDeviceLocalAccountPromptForNetworkWhenOffline,
             &should_prompt)) {
       return should_prompt;
     }
 
     // Default to true to allow network configuration if the policy is missing.
     return true;
   }
 
-  return !user_manager::UserManager::Get()->GetOwnerEmail().empty();
+  return !user_manager::UserManager::Get()->GetOwnerID().empty();
 }
 
 bool AppLaunchController::NeedOwnerAuthToConfigureNetwork() {
   if (need_owner_auth_to_configure_network_callback_)
     return need_owner_auth_to_configure_network_callback_->Run();
 
   policy::BrowserPolicyConnectorChromeOS* connector =
       g_browser_process->platform_part()->browser_policy_connector_chromeos();
   return !connector->IsEnterpriseManaged();
 }
@@ skipping 109 matching lines @@
   KioskAppLaunchError::Save(error);
   chrome::AttemptUserExit();
   CleanUp();
 }
 
 bool AppLaunchController::IsShowingNetworkConfigScreen() {
   return network_config_requested_;
 }
 
 }   // namespace chromeos