Change more base::ListValue methods to use std::unique_ptr.

chrome/browser/chromeos/login/existing_user_controller_browsertest.cc

 // 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.
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/macros.h"
+#include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/run_loop.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/login/existing_user_controller.h"
 #include "chrome/browser/chromeos/login/help_app_launcher.h"
 #include "chrome/browser/chromeos/login/helper.h"
 #include "chrome/browser/chromeos/login/screens/mock_base_screen_delegate.h"
 #include "chrome/browser/chromeos/login/session/user_session_manager.h"
 #include "chrome/browser/chromeos/login/session/user_session_manager_test_api.h"
 #include "chrome/browser/chromeos/login/supervised/supervised_user_creation_screen.h"
@@ skipping 167 matching lines @@
                           1,
                           HelpAppLauncher::HELP_CANT_ACCESS_ACCOUNT))
         .Times(1);
     EXPECT_CALL(*mock_login_display_, SetUIEnabled(true))
         .Times(1);
   }
 
   void RegisterUser(const std::string& user_id) {
     ListPrefUpdate users_pref(g_browser_process->local_state(),
                               "LoggedInUsers");
-    users_pref->AppendIfNotPresent(new base::StringValue(user_id));
+    users_pref->AppendIfNotPresent(
+        base::MakeUnique<base::StringValue>(user_id));
   }
 
   // ExistingUserController private member accessors.
   base::OneShotTimer* auto_login_timer() {
     return existing_user_controller()->auto_login_timer_.get();
   }
 
   AccountId auto_login_account_id() const {
     return existing_user_controller()->public_session_auto_login_account_id_;
   }
@@ skipping 540 matching lines @@
                        PRE_TestLoadingPublicUsersFromLocalState) {
   // First run propagates public accounts and stores them in Local State.
 }
 
 IN_PROC_BROWSER_TEST_F(ExistingUserControllerPublicSessionTest,
                        TestLoadingPublicUsersFromLocalState) {
   // Second run loads list of public accounts from Local State.
 }
 
 }  // namespace chromeos