cros: Remove unused method

chrome/browser/chromeos/login/supervised/supervised_user_creation_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/supervised/supervised_user_creation_screen.h"
 
 #include <utility>
 
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/wallpaper/wallpaper_controller.h"
@@ skipping 110 matching lines @@
 
 SupervisedUserCreationScreen::~SupervisedUserCreationScreen() {
   CameraPresenceNotifier::GetInstance()->RemoveObserver(this);
   if (sync_service_)
     sync_service_->RemoveObserver(this);
   if (actor_)
     actor_->SetDelegate(NULL);
   network_portal_detector::GetInstance()->RemoveObserver(this);
 }
 
-void SupervisedUserCreationScreen::PrepareToShow() {
-  if (actor_)
-    actor_->PrepareToShow();
-}
-
 void SupervisedUserCreationScreen::Show() {
   CameraPresenceNotifier::GetInstance()->AddObserver(this);
   if (actor_) {
     actor_->Show();
     // TODO(antrim) : temorary hack (until upcoming hackaton). Should be
     // removed once we have screens reworked.
     if (on_error_screen_)
       actor_->ShowPage(last_page_);
     else
       actor_->ShowIntroPage();
@@ skipping 483 matching lines @@
     selected_image_ = user_manager::User::USER_IMAGE_EXTERNAL;
   } else {
     NOTREACHED() << "Unexpected image type: " << image_type;
   }
 }
 
 void SupervisedUserCreationScreen::OnImageAccepted() {
 }
 
 }  // namespace chromeos