cros: Remove unused method

chrome/browser/chromeos/login/screens/reset_screen.h

 // Copyright (c) 2014 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_SCREENS_RESET_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_RESET_SCREEN_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 12 matching lines @@
 
 // Representation independent class that controls screen showing reset to users.
 class ResetScreen : public ResetModel,
                     public UpdateEngineClient::Observer {
  public:
   ResetScreen(BaseScreenDelegate* base_screen_delegate,
               ResetView* view);
   ~ResetScreen() override;
 
   // ResetModel implementation:
-  void PrepareToShow() override;
   void Show() override;
   void Hide() override;
   void OnViewDestroyed(ResetView* view) override;
   void OnUserAction(const std::string& action_id) override;
 
   // UpdateEngineClient::Observer implementation:
   void UpdateStatusChanged(const UpdateEngineClient::Status& status) override;
 
   void OnRollbackCheck(bool can_rollback);
 
@@ skipping 23 matching lines @@
   scoped_refptr<HelpAppLauncher> help_app_;
 
   base::WeakPtrFactory<ResetScreen> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ResetScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_RESET_SCREEN_H_