cros: Remove unused method

chrome/browser/chromeos/login/screens/user_image_screen.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_CHROMEOS_LOGIN_SCREENS_USER_IMAGE_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_USER_IMAGE_SCREEN_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 29 matching lines @@
                         public UserImageSyncObserver::Observer,
                         public CameraPresenceNotifier::Observer {
  public:
   UserImageScreen(BaseScreenDelegate* base_screen_delegate,
                   UserImageView* view);
   ~UserImageScreen() override;
 
   static UserImageScreen* Get(ScreenManager* manager);
 
   // BaseScreen implementation:
-  void PrepareToShow() override;
   void Show() override;
   void Hide() override;
 
   // UserImageScreenActor::Delegate implementation:
   void OnScreenReady() override;
   void OnPhotoTaken(const std::string& raw_data) override;
   void OnImageSelected(const std::string& image_url,
                        const std::string& image_type,
                        bool is_user_selection) override;
   void OnImageAccepted() override;
@@ skipping 83 matching lines @@
 
   // The time when we started wait for user image sync.
   base::Time sync_waiting_start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(UserImageScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_USER_IMAGE_SCREEN_H_