[cros] Fix first time Guest sign in.

chrome/browser/chromeos/login/existing_user_controller.cc

Index: chrome/browser/chromeos/login/existing_user_controller.cc
diff --git a/chrome/browser/chromeos/login/existing_user_controller.cc b/chrome/browser/chromeos/login/existing_user_controller.cc
index 21e8210e1736677300bb93684356bfbe5837b615..b0ebb8bc55895ad2ad3d24b515dd6b3adeff3f82 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.cc
+++ b/chrome/browser/chromeos/login/existing_user_controller.cc
@@ -459,6 +459,11 @@ void ExistingUserController::OnOffTheRecordLoginSuccess() {
     LoginUtils::Get()->CompleteOffTheRecordLogin(guest_mode_url_);
   } else {
     // Postpone CompleteOffTheRecordLogin until registration completion.
+    // TODO(nkostylev): Kind of hack. We have to instruct UserManager here
+    // that we're actually logged in as Guest user as we'll ask UserManager
+    // later in the code path whether we've signed in as Guest and depending
+    // on that would either show image screen or call CompleteOffTheRecordLogin.
+    UserManager::Get()->GuestUserLoggedIn();
     ActivateWizard(WizardController::kRegistrationScreenName);
   }