cros: Fold UserBoardModel into UserSelectionScreen.

chrome/browser/ui/webui/chromeos/login/user_board_screen_handler.h

 // Copyright 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_USER_BOARD_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_USER_BOARD_SCREEN_HANDLER_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/login/ui/views/user_board_view.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
 
 namespace chromeos {
 
+// TODO(jdufault): Rename to UserSelectionScreenHandler and ensure this in the
+// right directory. See crbug.com/672142.
+
 // A class that handles WebUI hooks in Gaia screen.
 class UserBoardScreenHandler : public BaseScreenHandler, public UserBoardView {
  public:
   UserBoardScreenHandler();
   ~UserBoardScreenHandler() override;
 
  private:
   // BaseScreenHandler implementation:
   void DeclareLocalizedValues(
       ::login::LocalizedValuesBuilder* builder) override;
@@ skipping 16 matching lines @@
                                const std::string& default_locale,
                                bool multiple_recommended_locales) override;
   void ShowBannerMessage(const base::string16& message) override;
   void ShowUserPodCustomIcon(const AccountId& account_id,
                              const base::DictionaryValue& icon) override;
   void HideUserPodCustomIcon(const AccountId& account_id) override;
   void SetAuthType(
       const AccountId& account_id,
       proximity_auth::ScreenlockBridge::LockHandler::AuthType auth_type,
       const base::string16& initial_value) override;
-
-  void Bind(UserBoardModel& model) override;
+  void Bind(UserSelectionScreen* screen) override;
   void Unbind() override;
   base::WeakPtr<UserBoardView> GetWeakPtr() override;
 
-  UserBoardModel* model_;
+  UserSelectionScreen* screen_ = nullptr;
   base::WeakPtrFactory<UserBoardScreenHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UserBoardScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_USER_BOARD_SCREEN_HANDLER_H_