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

chrome/browser/chromeos/login/users/scoped_test_user_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_USERS_SCOPED_TEST_USER_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USERS_SCOPED_TEST_USER_MANAGER_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 
 namespace chromeos {
 
 class ChromeUserManager;
 
 // Helper class for unit tests. Initializes the UserManager singleton on
 // construction and tears it down again on destruction.
 class ScopedTestUserManager {
  public:
   ScopedTestUserManager();
   ~ScopedTestUserManager();
 
  private:
-  scoped_ptr<ChromeUserManager> chrome_user_manager_;
+  std::unique_ptr<ChromeUserManager> chrome_user_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedTestUserManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USERS_SCOPED_TEST_USER_MANAGER_H_