cros: Remove unused method

chrome/browser/ui/webui/chromeos/login/wrong_hwid_screen_handler.cc

 // Copyright (c) 2013 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/ui/webui/chromeos/login/wrong_hwid_screen_handler.h"
 
 #include "chrome/browser/ui/webui/chromeos/login/oobe_screen.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/login/localized_values_builder.h"
 
 namespace {
 
 const char kJsScreenPath[] = "login.WrongHWIDScreen";
 
 }  // namespace
 
 namespace chromeos {
 
 WrongHWIDScreenHandler::WrongHWIDScreenHandler()
     : BaseScreenHandler(kJsScreenPath),
       delegate_(NULL),
       show_on_init_(false) {
 }
 
 WrongHWIDScreenHandler::~WrongHWIDScreenHandler() {
   if (delegate_)
     delegate_->OnActorDestroyed(this);
 }
 
-void WrongHWIDScreenHandler::PrepareToShow() {
-}
-
 void WrongHWIDScreenHandler::Show() {
   if (!page_is_ready()) {
     show_on_init_ = true;
     return;
   }
   ShowScreen(OobeScreen::SCREEN_WRONG_HWID);
 }
 
 void WrongHWIDScreenHandler::Hide() {
 }
@@ skipping 28 matching lines @@
 void WrongHWIDScreenHandler::RegisterMessages() {
   AddCallback("wrongHWIDOnSkip", &WrongHWIDScreenHandler::HandleOnSkip);
 }
 
 void WrongHWIDScreenHandler::HandleOnSkip() {
   if (delegate_)
     delegate_->OnExit();
 }
 
 }  // namespace chromeos