Implement ErrorScreenHandler::Hide method

chrome/browser/chromeos/login/screens/error_screen.cc

 // Copyright (c) 2012 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/screens/error_screen.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 221 matching lines @@
 
 void ErrorScreen::PolicyLoadFailed() {
   LOG(FATAL);
 }
 
 void ErrorScreen::OnOnlineChecked(const std::string& username, bool success) {
   LOG(FATAL);
 }
 
 void ErrorScreen::DefaultHideCallback() {
-  if (view_)
+  if (parent_screen_ != OobeUI::SCREEN_UNKNOWN && view_)
     view_->ShowScreen(parent_screen_);
   SetParentScreen(OobeUI::SCREEN_UNKNOWN);
 }
 
 void ErrorScreen::OnConfigureCerts() {
   gfx::NativeWindow native_window =
       LoginDisplayHostImpl::default_host()->GetNativeWindow();
   CertificateManagerDialog* dialog = new CertificateManagerDialog(
       ProfileHelper::GetSigninProfile(), NULL, native_window);
   dialog->Show();
@@ skipping 65 matching lines @@
   }
 
   if (guest_login_performer_)
     return;
 
   guest_login_performer_.reset(new ChromeLoginPerformer(this));
   guest_login_performer_->LoginOffTheRecord();
 }
 
 }  // namespace chromeos