cros: Remove unused method

chrome/browser/chromeos/login/enrollment/auto_enrollment_check_screen.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_CHROMEOS_LOGIN_ENROLLMENT_AUTO_ENROLLMENT_CHECK_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_AUTO_ENROLLMENT_CHECK_SCREEN_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 30 matching lines @@
 
   // Clears the cached state causing the forced enrollment check to be retried.
   void ClearState();
 
   void set_auto_enrollment_controller(
       AutoEnrollmentController* auto_enrollment_controller) {
     auto_enrollment_controller_ = auto_enrollment_controller;
   }
 
   // BaseScreen implementation:
-  void PrepareToShow() override;
   void Show() override;
   void Hide() override;
   std::string GetName() const override;
 
   // AutoEnrollmentCheckScreenActor::Delegate implementation:
   void OnActorDestroyed(AutoEnrollmentCheckScreenActor* actor) override;
 
   // NetworkPortalDetector::Observer implementation:
   void OnPortalDetectionCompleted(
       const NetworkState* network,
@@ skipping 44 matching lines @@
   ErrorScreen::ConnectRequestCallbackSubscription connect_request_subscription_;
 
   base::WeakPtrFactory<AutoEnrollmentCheckScreen> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AutoEnrollmentCheckScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_AUTO_ENROLLMENT_CHECK_SCREEN_H_