cros: Remove unused method

chrome/browser/chromeos/login/enrollment/auto_enrollment_check_screen.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/enrollment/auto_enrollment_check_screen.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/location.h"
@@ skipping 56 matching lines @@
 
 void AutoEnrollmentCheckScreen::ClearState() {
   auto_enrollment_progress_subscription_.reset();
   connect_request_subscription_.reset();
   network_portal_detector::GetInstance()->RemoveObserver(this);
 
   auto_enrollment_state_ = policy::AUTO_ENROLLMENT_STATE_IDLE;
   captive_portal_status_ = NetworkPortalDetector::CAPTIVE_PORTAL_STATUS_UNKNOWN;
 }
 
-void AutoEnrollmentCheckScreen::PrepareToShow() {
-}
-
 void AutoEnrollmentCheckScreen::Show() {
   // If the decision got made already, don't show the screen at all.
   if (AutoEnrollmentController::GetMode() !=
           AutoEnrollmentController::MODE_FORCED_RE_ENROLLMENT ||
       IsCompleted()) {
     SignalCompletion();
     return;
   }
 
   // Start from a clean slate.
@@ skipping 184 matching lines @@
   }
   NOTREACHED();
   return false;
 }
 
 void AutoEnrollmentCheckScreen::OnConnectRequested() {
   auto_enrollment_controller_->Retry();
 }
 
 }  // namespace chromeos