cros: Remove unused method

chrome/browser/chromeos/login/screens/error_screen.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/chromeos/login/screens/error_screen.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 53 matching lines @@
   network_state_informer_->Init();
   if (view_)
     view_->Bind(*this);
 }
 
 ErrorScreen::~ErrorScreen() {
   if (view_)
     view_->Unbind();
 }
 
-void ErrorScreen::PrepareToShow() {
-  if (view_)
-    view_->PrepareToShow();
-}
-
 void ErrorScreen::Show() {
   if (!on_hide_callback_) {
     SetHideCallback(base::Bind(&ErrorScreen::DefaultHideCallback,
                                weak_factory_.GetWeakPtr()));
   }
   if (view_)
     view_->Show();
 }
 
 void ErrorScreen::Hide() {
@@ skipping 248 matching lines @@
   }
 
   if (guest_login_performer_)
     return;
 
   guest_login_performer_.reset(new ChromeLoginPerformer(this));
   guest_login_performer_->LoginOffTheRecord();
 }
 
 }  // namespace chromeos