cros: Break BaseScreenHandler into two classes.

chrome/browser/ui/webui/chromeos/login/terms_of_service_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/terms_of_service_screen_handler.h"
 
 #include <memory>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 20 matching lines @@
 namespace {
 
 const char kJsScreenPath[] = "login.TermsOfServiceScreen";
 
 }  // namespace
 
 namespace chromeos {
 
 TermsOfServiceScreenHandler::TermsOfServiceScreenHandler(
     CoreOobeView* core_oobe_view)
-    : core_oobe_view_(core_oobe_view) {
+    : BaseScreenHandler(kScreenId), core_oobe_view_(core_oobe_view) {
   set_call_js_prefix(kJsScreenPath);
 }
 
 TermsOfServiceScreenHandler::~TermsOfServiceScreenHandler() {
   if (screen_)
     screen_->OnViewDestroyed(this);
 }
 
 void TermsOfServiceScreenHandler::RegisterMessages() {
   AddCallback("termsOfServiceBack",
@@ skipping 110 matching lines @@
     input_method_manager->GetActiveIMEState()->ChangeInputMethod(
         input_methods.front(), false /* show_message */);
   }
 
   // Updates the domain name shown in the UI.
   UpdateDomainInUI();
 
   // Update the UI to show an error message or the Terms of Service.
   UpdateTermsOfServiceInUI();
 
-  ShowScreen(OobeScreen::SCREEN_TERMS_OF_SERVICE);
+  ShowScreen(kScreenId);
 }
 
 void TermsOfServiceScreenHandler::UpdateDomainInUI() {
   if (page_is_ready())
     CallJS("setDomain", domain_);
 }
 
 void TermsOfServiceScreenHandler::UpdateTermsOfServiceInUI() {
   if (!page_is_ready())
     return;
@@ skipping 21 matching lines @@
   // and continue" button should not be accessible. If the user managed to
   // activate it somehow anway, do not treat this as acceptance of the Terms
   // and Conditions and end the session instead, as if the user had declined.
   if (terms_of_service_.empty())
     screen_->OnDecline();
   else
     screen_->OnAccept();
 }
 
 }  // namespace chromeos