cros: Remove unused method

chrome/browser/ui/webui/chromeos/login/hid_detection_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_HID_DETECTION_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_HID_DETECTION_SCREEN_HANDLER_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 11 matching lines @@
 // WebUI implementation of HIDDetectionScreenView.
 class HIDDetectionScreenHandler
     : public HIDDetectionView,
       public BaseScreenHandler {
  public:
 
   explicit HIDDetectionScreenHandler(CoreOobeActor* core_oobe_actor);
   ~HIDDetectionScreenHandler() override;
 
   // HIDDetectionView implementation:
-  void PrepareToShow() override;
   void Show() override;
   void Hide() override;
   void Bind(HIDDetectionModel& model) override;
   void Unbind() override;
   void CheckIsScreenRequired(
       const base::Callback<void(bool)>& on_check_done) override;
 
   // BaseScreenHandler implementation:
   void DeclareLocalizedValues(
       ::login::LocalizedValuesBuilder* builder) override;
@@ skipping 14 matching lines @@
   // Keeps whether screen should be shown right after initialization.
   bool show_on_init_;
 
   DISALLOW_COPY_AND_ASSIGN(HIDDetectionScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_HID_DETECTION_SCREEN_HANDLER_H_