cros: Remove unused method

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

 // 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.
 
 #include "chrome/browser/ui/webui/chromeos/login/error_screen_handler.h"
 
 #include "ash/common/system/chromeos/devicetype_utils.h"
 #include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
 #include "chrome/browser/chromeos/login/screens/network_error_model.h"
@@ skipping 16 matching lines @@
       show_on_init_(false),
       showing_(false),
       weak_ptr_factory_(this) {
 }
 
 ErrorScreenHandler::~ErrorScreenHandler() {
   if (model_)
     model_->OnViewDestroyed(this);
 }
 
-void ErrorScreenHandler::PrepareToShow() {
-}
-
 void ErrorScreenHandler::Show() {
   if (!page_is_ready()) {
     show_on_init_ = true;
     return;
   }
   BaseScreenHandler::ShowScreen(OobeScreen::SCREEN_ERROR_MESSAGE);
   if (model_)
     model_->OnShow();
   showing_ = true;
 }
@@ skipping 78 matching lines @@
     show_on_init_ = false;
   }
 }
 
 void ErrorScreenHandler::OnConnectToNetworkRequested() {
   if (showing_ && model_)
     model_->OnUserAction(NetworkErrorModel::kUserActionConnectRequested);
 }
 
 }  // namespace chromeos