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

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.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_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 #pragma once
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/task.h"
 #include "chrome/browser/browsing_data_remover.h"
 #include "chrome/browser/chromeos/login/help_app_launcher.h"
+#include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/chromeos/system_key_event_listener.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
 #include "content/browser/webui/web_ui.h"
 
 class BrowsingDataRemover;
 
 namespace base {
 class DictionaryValue;
 class ListValue;
 }
@@ skipping 43 matching lines @@
 
   // Attempts to remove given user.
   virtual void RemoveUser(const std::string& username) = 0;
 
   // Shows Enterprise Enrollment screen.
   virtual void ShowEnterpriseEnrollmentScreen() = 0;
 
   // Let the delegate know about the handler it is supposed to be using.
   virtual void SetWebUIHandler(LoginDisplayWebUIHandler* webui_handler) = 0;
 
+  // Returns users list to be shown.
+  virtual const std::vector<UserManager::User>& GetUsers() const = 0;
+
+  // Whether login as guest is available.
+  virtual bool IsShowGuest() const = 0;
+
+  // Whether new user pod is available.
+  virtual bool IsShowNewUser() const = 0;
+
  protected:
   virtual ~SigninScreenHandlerDelegate() {}
 };
 
 // A class that handles the WebUI hooks in sign-in screen in OobeDisplay
 // and LoginDisplay.
 class SigninScreenHandler : public BaseScreenHandler,
                             public LoginDisplayWebUIHandler,
                             public BrowsingDataRemover::Observer,
                             public SystemKeyEventListener::CapsLockObserver {
  public:
   SigninScreenHandler();
   virtual ~SigninScreenHandler();
 
   // Shows the sign in screen. |oobe_ui| indicates whether the signin
   // screen is for OOBE or usual sign-in flow.
   void Show(bool oobe_ui);
 
+  // Sets delegate to be used by the handler. It is guaranteed that valid
+  // delegate is set before Show() method will be called.
+  void SetDelegate(SigninScreenHandlerDelegate* delegate);
+
  private:
   friend class ReportDnsCacheClearedOnUIThread;
 
   // BaseScreenHandler implementation:
   virtual void GetLocalizedStrings(
       base::DictionaryValue* localized_strings) OVERRIDE;
   virtual void Initialize() OVERRIDE;
 
   // WebUIMessageHandler implementation:
   virtual void RegisterMessages() OVERRIDE;
@@ skipping 115 matching lines @@
 
   // CapsLock state change notifier instance;
   SystemKeyEventListener* key_event_listener_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_