Remove DialogDelegate::UseNewStyle and unused code.

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 "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 50 matching lines @@
   LOG(WARNING) << "Offline message is hidden";
 }
 
 void ErrorScreenHandler::FixCaptivePortal() {
   if (!captive_portal_window_proxy_.get()) {
     content::WebContents* web_contents =
         LoginDisplayHostImpl::default_host()->GetWebUILoginView()->
             GetWebContents();
     captive_portal_window_proxy_.reset(
         new CaptivePortalWindowProxy(network_state_informer_.get(),
-                                     GetNativeWindow(),
                                      web_contents));
   }
   captive_portal_window_proxy_->ShowIfRedirected();
 }
 
 void ErrorScreenHandler::ShowCaptivePortal() {
   // This call is an explicit user action
   // i.e. clicking on link so force dialog show.
   FixCaptivePortal();
   captive_portal_window_proxy_->Show();
@@ skipping 98 matching lines @@
     params.SetInteger("errorState", static_cast<int>(error_state_));
     params.SetString("network", network_);
     params.SetBoolean("guestSigninAllowed", guest_signin_allowed_);
     params.SetBoolean("offlineLoginAllowed", offline_login_allowed_);
     Show(parent_screen_, &params);
     show_on_init_ = false;
   }
 }
 
 }  // namespace chromeos