Cryptohome: Notify about error in async calls if cryptohome is not ready yet.

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 c1819992abd0e5cedac190f3c88ffa9e70ab40ae..70f0d5a73680ae5dc71a8bda0db27c6c662b519e 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.cc
+++ b/chrome/browser/chromeos/login/existing_user_controller.cc
@@ -624,6 +624,10 @@ void ExistingUserController::OnAuthFailure(const AuthFailure& failure) {
     ShowTPMError();
   } else if (!online_succeeded_for_.empty()) {
     ShowGaiaPasswordChanged(online_succeeded_for_);
+  } else if (last_login_attempt_username_ == chromeos::login::kGuestUserName) {
+    // Show no errors, just re-enable input.
+    login_display_->ClearAndEnablePassword();
+    StartPublicSessionAutoLoginTimer();
   } else {
     // Check networking after trying to login in case user is
     // cached locally or the local admin account.