cros: Remove unused method

chrome/browser/ui/webui/chromeos/login/enrollment_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_ENROLLMENT_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_ENROLLMENT_SCREEN_HANDLER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 22 matching lines @@
       const scoped_refptr<NetworkStateInformer>& network_state_informer,
       NetworkErrorModel* network_error_model);
   ~EnrollmentScreenHandler() override;
 
   // Implements WebUIMessageHandler:
   void RegisterMessages() override;
 
   // Implements EnrollmentScreenActor:
   void SetParameters(Controller* controller,
                      const policy::EnrollmentConfig& config) override;
-  void PrepareToShow() override;
   void Show() override;
   void Hide() override;
   void ShowSigninScreen() override;
   void ShowAdJoin() override;
   void ShowAttributePromptScreen(const std::string& asset_id,
                                  const std::string& location) override;
   void ShowAttestationBasedEnrollmentSuccessScreen(
       const std::string& enterprise_domain) override;
   void ShowEnrollmentSpinnerScreen() override;
   void ShowAuthError(const GoogleServiceAuthError& error) override;
@@ skipping 91 matching lines @@
   scoped_refptr<HelpAppLauncher> help_app_;
 
   base::WeakPtrFactory<EnrollmentScreenHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EnrollmentScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_ENROLLMENT_SCREEN_HANDLER_H_