Implement ErrorScreenHandler::Hide method

chrome/browser/ui/webui/chromeos/login/error_screen_handler.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/ui/webui/chromeos/login/error_screen_handler.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
 #include "chrome/browser/chromeos/login/screens/network_error_model.h"
 #include "chrome/grit/chromium_strings.h"
@@ skipping 28 matching lines @@
   if (!page_is_ready()) {
     show_on_init_ = true;
     return;
   }
   BaseScreenHandler::ShowScreen(OobeUI::kScreenErrorMessage, NULL);
   if (model_)
     model_->OnShow();
 }
 
 void ErrorScreenHandler::Hide() {
+  if (model_)
+   model_->OnHide();
 }
 
 void ErrorScreenHandler::Bind(NetworkErrorModel& model) {
   model_ = &model;
   BaseScreenHandler::SetBaseScreen(model_);
 }
 
 void ErrorScreenHandler::Unbind() {
   model_ = nullptr;
   BaseScreenHandler::SetBaseScreen(nullptr);
@@ skipping 65 matching lines @@
     return;
 
   if (show_on_init_) {
     // TODO(nkostylev): Check that context initial state is properly passed.
     Show();
     show_on_init_ = false;
   }
 }
 
 }  // namespace chromeos