cros: Break BaseScreenHandler into two classes.

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/error_screen.h"
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/login/localized_values_builder.h"
 #include "ui/strings/grit/ui_strings.h"
 
 namespace {
 
 const char kJsScreenPath[] = "login.ErrorMessageScreen";
 
 }  // namespace
 
 namespace chromeos {
 
-ErrorScreenHandler::ErrorScreenHandler() : weak_ptr_factory_(this) {
+ErrorScreenHandler::ErrorScreenHandler()
+    : BaseScreenHandler(kScreenId), weak_ptr_factory_(this) {
   set_call_js_prefix(kJsScreenPath);
 }
 
 ErrorScreenHandler::~ErrorScreenHandler() {
   if (screen_)
     screen_->OnViewDestroyed(this);
 }
 
 void ErrorScreenHandler::Show() {
   if (!page_is_ready()) {
     show_on_init_ = true;
     return;
   }
-  BaseScreenHandler::ShowScreen(OobeScreen::SCREEN_ERROR_MESSAGE);
+  BaseScreenHandler::ShowScreen(kScreenId);
   if (screen_)
     screen_->OnShow();
   showing_ = true;
 }
 
 void ErrorScreenHandler::Hide() {
   showing_ = false;
   if (screen_)
     screen_->OnHide();
 }
@@ skipping 72 matching lines @@
   if (showing_ && screen_)
     screen_->OnUserAction(ErrorScreen::kUserActionConnectRequested);
 }
 
 void ErrorScreenHandler::HandleHideCaptivePortal() {
   if (screen_)
     screen_->HideCaptivePortal();
 }
 
 }  // namespace chromeos