[ObjC ARC] Converts ios/chrome/browser/ui/settings:test_support to ARC.

ios/chrome/browser/ui/settings/passphrase_collection_view_controller_test.mm

 // 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.
 
 #import "ios/chrome/browser/ui/settings/passphrase_collection_view_controller_test.h"
 
 #import <UIKit/UIKit.h>
 
 #include <memory>
 
@@ skipping 11 matching lines @@
 #import "ios/chrome/browser/signin/authentication_service_fake.h"
 #include "ios/chrome/browser/sync/ios_chrome_profile_sync_service_factory.h"
 #include "ios/chrome/browser/sync/ios_chrome_profile_sync_test_util.h"
 #include "ios/chrome/browser/sync/sync_setup_service.h"
 #include "ios/chrome/browser/sync/sync_setup_service_factory.h"
 #import "ios/chrome/browser/ui/settings/settings_navigation_controller.h"
 #import "ios/public/provider/chrome/browser/signin/fake_chrome_identity_service.h"
 #import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 using testing::DefaultValue;
 using testing::NiceMock;
 using testing::Return;
 
 std::unique_ptr<sync_preferences::PrefServiceSyncable> CreatePrefService() {
   sync_preferences::PrefServiceMockFactory factory;
   scoped_refptr<user_prefs::PrefRegistrySyncable> registry(
       new user_prefs::PrefRegistrySyncable);
   std::unique_ptr<sync_preferences::PrefServiceSyncable> prefs =
       factory.CreateSyncable(registry.get());
@@ skipping 58 matching lines @@
 
 void PassphraseCollectionViewControllerTest::SetUpNavigationController(
     UIViewController* test_controller) {
   dummy_controller_.reset([[UIViewController alloc] init]);
   nav_controller_.reset([[SettingsNavigationController alloc]
       initWithRootViewController:dummy_controller_
                     browserState:chrome_browser_state_.get()
                         delegate:nil]);
   [nav_controller_ pushViewController:test_controller animated:NO];
 }