Added login screen mode for adding users into session.

chrome/browser/chromeos/login/login_utils.cc

Index: chrome/browser/chromeos/login/login_utils.cc
diff --git a/chrome/browser/chromeos/login/login_utils.cc b/chrome/browser/chromeos/login/login_utils.cc
index 93883cdae13f730d5adedb6c2057aa8d7d6f033a..d2164a55e4a5f34f52ef75a17e79a77199d21f7b 100644
--- a/chrome/browser/chromeos/login/login_utils.cc
+++ b/chrome/browser/chromeos/login/login_utils.cc
@@ -311,7 +311,7 @@ void LoginUtilsImpl::DoBrowserLaunch(Profile* profile,
   // guarantees that the message loop will be referenced by the
   // browser before it is dereferenced by the login host.
   if (login_host)
-    login_host->OnSessionStart();
+    login_host->Finalize();
   UserManager::Get()->SessionStarted();
 }