Convert //chrome/browser/chromeos from scoped_ptr to std::unique_ptr

chrome/browser/chromeos/login/signin_screen_controller.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_SCREEN_CONTROLLER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_SCREEN_CONTROLLER_H_
 
 #include "base/macros.h"
 #include "chrome/browser/chromeos/login/screens/gaia_screen.h"
 #include "chrome/browser/chromeos/login/screens/user_selection_screen.h"
@@ skipping 51 matching lines @@
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
   static SignInScreenController* instance_;
 
   OobeUI* oobe_ui_ = nullptr;
 
   // Reference to the WebUI handling layer for the login screen
   LoginDisplayWebUIHandler* webui_handler_ = nullptr;
 
-  scoped_ptr<GaiaScreen> gaia_screen_;
-  scoped_ptr<UserSelectionScreen> user_selection_screen_;
+  std::unique_ptr<GaiaScreen> gaia_screen_;
+  std::unique_ptr<UserSelectionScreen> user_selection_screen_;
 
   // Used for notifications during the login process.
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(SignInScreenController);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_SCREEN_CONTROLLER_H_