[cros,de-hack] Get rid of singleton for the WebUILoginScreen.

chrome/browser/chromeos/login/webui_login_display_host.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_WEBUI_LOGIN_DISPLAY_HOST_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_WEBUI_LOGIN_DISPLAY_HOST_H_
 #pragma once
 
 #include <string>
 
 #include "chrome/browser/chromeos/login/base_login_display_host.h"
 
 namespace gfx {
 class Rect;
 }  // namespace gfx
 
 namespace chromeos {
 
 class OobeUI;
+class WebUILoginDisplay;
 class WebUILoginView;
 
 // WebUI-specific implementation of the OOBE/login screen host. Uses
 // WebUILoginDisplay as the login screen UI implementation,
 class WebUILoginDisplayHost : public BaseLoginDisplayHost {
  public:
   explicit WebUILoginDisplayHost(const gfx::Rect& background_bounds);
   virtual ~WebUILoginDisplayHost();
 
   // LoginDisplayHost implementation:
-  virtual LoginDisplay* CreateLoginDisplay(LoginDisplay::Delegate* delegate)
-      const OVERRIDE;
+  virtual LoginDisplay* CreateLoginDisplay(
+      LoginDisplay::Delegate* delegate) OVERRIDE;
   virtual gfx::NativeWindow GetNativeWindow() const OVERRIDE;
   virtual void SetOobeProgress(BackgroundView::LoginStep step) OVERRIDE;
   virtual void SetOobeProgressBarVisible(bool visible) OVERRIDE;
   virtual void SetShutdownButtonEnabled(bool enable) OVERRIDE;
   virtual void SetStatusAreaEnabled(bool enable) OVERRIDE;
   virtual void SetStatusAreaVisible(bool visible) OVERRIDE;
   virtual void ShowBackground() OVERRIDE;
   virtual void StartWizard(const std::string& first_screen_name,
                            const GURL& start_url) OVERRIDE;
   virtual void StartSignInScreen() OVERRIDE;
 
   // BaseLoginDisplayHost overrides:
   virtual WizardController* CreateWizardController() OVERRIDE;
 
  private:
   // Loads given URL. Creates WebUILoginView if needed.
   void LoadURL(const GURL& url);
 
   OobeUI* GetOobeUI() const;
 
   // Container of the screen we are displaying.
   views::Widget* login_window_;
 
   // Container of the view we are displaying.
   WebUILoginView* login_view_;
 
+  // Login display we are using.
+  WebUILoginDisplay* webui_login_display_;
+
   DISALLOW_COPY_AND_ASSIGN(WebUILoginDisplayHost);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WEBUI_LOGIN_DISPLAY_HOST_H_