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

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

 // Copyright 2015 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/bandwidth_management_collection_view_controller.h"
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/run_loop.h"
 #include "base/test/test_simple_task_runner.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/testing_pref_service.h"
 #include "components/sync_preferences/pref_service_mock_factory.h"
 #include "components/sync_preferences/pref_service_syncable.h"
 #include "ios/chrome/browser/browser_state/test_chrome_browser_state.h"
 #include "ios/chrome/browser/pref_names.h"
 #include "ios/chrome/browser/prefs/browser_prefs.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_controller_test.h"
 #import "ios/chrome/browser/ui/settings/dataplan_usage_collection_view_controller.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ios/chrome/test/ios_chrome_scoped_testing_local_state.h"
 #include "ios/chrome/test/testing_application_context.h"
 #include "ios/web/public/test/test_web_thread.h"
 #include "net/log/test_net_log.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 class BandwidthManagementCollectionViewControllerTest
     : public CollectionViewControllerTest {
  public:
   BandwidthManagementCollectionViewControllerTest()
       : loop_(base::MessageLoop::TYPE_IO),
         ui_thread_(web::WebThread::UI, &loop_),
         io_thread_(web::WebThread::IO, &loop_) {}
 
@@ skipping 12 matching lines @@
     chrome_browser_state_ = test_cbs_builder.Build();
 
     CreateController();
   }
 
   void TearDown() override {
     base::RunLoop().RunUntilIdle();
     CollectionViewControllerTest::TearDown();
   }
 
-  CollectionViewController* NewController() override NS_RETURNS_RETAINED {
+  CollectionViewController* InstantiateController() override {
     return [[BandwidthManagementCollectionViewController alloc]
         initWithBrowserState:chrome_browser_state_.get()];
   }
 
   base::MessageLoop loop_;
   web::TestWebThread ui_thread_;
   web::TestWebThread io_thread_;
   net::TestNetLog net_log_;
   IOSChromeScopedTestingLocalState local_state_;
 
@@ skipping 11 matching lines @@
       l10n_util::GetNSString(IDS_IOS_OPTIONS_PRELOAD_WEBPAGES);
   NSString* expected_subtitle = [DataplanUsageCollectionViewController
       currentLabelForPreference:chrome_browser_state_->GetPrefs()
                        basePref:prefs::kNetworkPredictionEnabled
                        wifiPref:prefs::kNetworkPredictionWifiOnly];
   CheckTextCellTitleAndSubtitle(expected_title, expected_subtitle,
                                 action_section, 0);
 }
 
 }  // namespace