cros: Remove unused method

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

 // Copyright 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_UI_WEBUI_CHROMEOS_LOGIN_SUPERVISED_USER_CREATION_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SUPERVISED_USER_CREATION_SCREEN_HANDLER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 51 matching lines @@
     virtual void OnPhotoTaken(const std::string& raw_data) = 0;
     virtual void OnImageSelected(const std::string& image_url,
                                  const std::string& image_type) = 0;
     virtual void OnImageAccepted() = 0;
     virtual void OnPageSelected(const std::string& page) = 0;
   };
 
   SupervisedUserCreationScreenHandler();
   ~SupervisedUserCreationScreenHandler() override;
 
-  virtual void PrepareToShow();
   virtual void Show();
   virtual void Hide();
   virtual void SetDelegate(Delegate* delegate);
 
   void ShowManagerPasswordError();
 
   void ShowIntroPage();
   void ShowUsernamePage();
 
   // Shows progress or error message close in the button area. |is_progress| is
@@ skipping 51 matching lines @@
   void UpdateText(const std::string& element_id, const base::string16& text);
 
   Delegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(SupervisedUserCreationScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SUPERVISED_USER_CREATION_SCREEN_HANDLER_H_