Revert of Introduce SessionManager that will contain code to start user session on Chrome OS

chrome/browser/ui/webui/chromeos/login/reset_screen_handler.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_RESET_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_RESET_SCREEN_HANDLER_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/chromeos/login/help_app_launcher.h"
 #include "chrome/browser/chromeos/login/screens/reset_screen_actor.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
 #include "chromeos/dbus/update_engine_client.h"
 #include "content/public/browser/web_ui.h"
 
-class PrefRegistrySimple;
-
 namespace chromeos {
 
 // WebUI implementation of ResetScreenActor.
 class ResetScreenHandler : public ResetScreenActor,
                            public BaseScreenHandler,
                            public UpdateEngineClient::Observer {
  public:
   ResetScreenHandler();
   virtual ~ResetScreenHandler();
 
   // ResetScreenActor implementation:
   virtual void PrepareToShow() OVERRIDE;
   virtual void Show() OVERRIDE;
   virtual void Hide() OVERRIDE;
   virtual void SetDelegate(Delegate* delegate) OVERRIDE;
 
   // BaseScreenHandler implementation:
   virtual void DeclareLocalizedValues(LocalizedValuesBuilder* builder) OVERRIDE;
   virtual void Initialize() OVERRIDE;
 
   // WebUIMessageHandler implementation:
   virtual void RegisterMessages() OVERRIDE;
 
   // UpdateEngineClient::Observer implementation:
   virtual void UpdateStatusChanged(
       const UpdateEngineClient::Status& status) OVERRIDE;
 
   void OnRollbackCheck(bool can_rollback);
 
-  // Registers Local State preferences.
-  static void RegisterPrefs(PrefRegistrySimple* registry);
-
  private:
   // JS messages handlers.
   void HandleOnCancel();
   void HandleOnRestart(bool should_rollback);
   void HandleOnPowerwash(bool rollback_checked);
   void HandleOnLearnMore();
 
   void ChooseAndApplyShowScenario();
   void OnRollbackFlagFileCheckDone(scoped_ptr<bool> file_exists);
   void ShowWithParams();
@@ skipping 21 matching lines @@
   bool preparing_for_rollback_;
 
   base::WeakPtrFactory<ResetScreenHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ResetScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_RESET_SCREEN_HANDLER_H_