cros: Remove unused method

chrome/browser/chromeos/login/enrollment/enrollment_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_ENROLLMENT_ENROLLMENT_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_ENROLLMENT_SCREEN_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 36 matching lines @@
   static EnrollmentScreen* Get(ScreenManager* manager);
 
   // Setup how this screen will handle enrollment.
   //   |shark_controller| is an interface that is used to communicate with a
   //     remora device or a slave device for remote enrollment.
   void SetParameters(
       const policy::EnrollmentConfig& enrollment_config,
       pairing_chromeos::ControllerPairingController* shark_controller);
 
   // BaseScreen implementation:
-  void PrepareToShow() override;
   void Show() override;
   void Hide() override;
   std::string GetName() const override;
 
   // EnrollmentScreenActor::Controller implementation:
   void OnLoginDone(const std::string& user,
                    const std::string& auth_code) override;
   void OnRetry() override;
   void OnCancel() override;
   void OnConfirmationClosed() override;
@@ skipping 91 matching lines @@
   std::unique_ptr<base::ElapsedTimer> elapsed_timer_;
   std::unique_ptr<EnterpriseEnrollmentHelper> enrollment_helper_;
   base::WeakPtrFactory<EnrollmentScreen> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EnrollmentScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_ENROLLMENT_SCREEN_H_