cros: Break BaseScreenHandler into two classes.

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

 // Copyright 2014 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/controller_pairing_screen_handler.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_util.h"
 #include "chrome/browser/chromeos/login/oobe_screen.h"
 #include "chrome/grit/generated_resources.h"
@@ skipping 12 matching lines @@
 const char kCallbackUserActed[] = "userActed";
 const char kCallbackContextChanged[] = "contextChanged";
 
 bool IsBootstrappingMaster() {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
       chromeos::switches::kOobeBootstrappingMaster);
 }
 
 }  // namespace
 
-ControllerPairingScreenHandler::ControllerPairingScreenHandler() {
+ControllerPairingScreenHandler::ControllerPairingScreenHandler()
+    : BaseScreenHandler(kScreenId) {
   set_call_js_prefix(kJsScreenPath);
 }
 
 ControllerPairingScreenHandler::~ControllerPairingScreenHandler() {
   if (delegate_)
     delegate_->OnViewDestroyed(this);
 }
 
 void ControllerPairingScreenHandler::HandleUserActed(
     const std::string& action) {
@@ skipping 99 matching lines @@
                       &ControllerPairingScreenHandler::HandleUserActed);
   AddPrefixedCallback(kCallbackContextChanged,
                       &ControllerPairingScreenHandler::HandleContextChanged);
 }
 
 void ControllerPairingScreenHandler::Show() {
   if (!page_is_ready()) {
     show_on_init_ = true;
     return;
   }
-  ShowScreen(OobeScreen::SCREEN_OOBE_CONTROLLER_PAIRING);
+  ShowScreen(kScreenId);
 }
 
 void ControllerPairingScreenHandler::Hide() {
 }
 
 void ControllerPairingScreenHandler::SetDelegate(Delegate* delegate) {
   delegate_ = delegate;
   if (page_is_ready())
     Initialize();
 }
 
 void ControllerPairingScreenHandler::OnContextChanged(
     const base::DictionaryValue& diff) {
   CallJS(kMethodContextChanged, diff);
 }
 
 content::BrowserContext* ControllerPairingScreenHandler::GetBrowserContext() {
   return web_ui()->GetWebContents()->GetBrowserContext();
 }
 
 }  // namespace chromeos