Remove unused email from install attributes and add support for AD.

chrome/browser/chromeos/app_mode/kiosk_app_manager.cc

Index: chrome/browser/chromeos/app_mode/kiosk_app_manager.cc
diff --git a/chrome/browser/chromeos/app_mode/kiosk_app_manager.cc b/chrome/browser/chromeos/app_mode/kiosk_app_manager.cc
index ac4dfc442d4330b55a9f95b1f35d83fb5e724be8..147172ff336204df660e2330334beb21d6af5cee 100644
--- a/chrome/browser/chromeos/app_mode/kiosk_app_manager.cc
+++ b/chrome/browser/chromeos/app_mode/kiosk_app_manager.cc
@@ -259,8 +259,9 @@ void KioskAppManager::EnableConsumerKioskAutoLaunch(
   policy::BrowserPolicyConnectorChromeOS* connector =
       g_browser_process->platform_part()->browser_policy_connector_chromeos();
   connector->GetInstallAttributes()->LockDevice(
-      std::string(),  // user
       policy::DEVICE_MODE_CONSUMER_KIOSK_AUTOLAUNCH,
+      std::string(),  // domain
+      std::string(),  // realm
       std::string(),  // device_id
       base::Bind(
           &KioskAppManager::OnLockDevice, base::Unretained(this), callback));