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

ios/chrome/browser/ui/settings/voicesearch_collection_view_controller_unittest.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/voicesearch_collection_view_controller.h"
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/mac/foundation_util.h"
-#import "base/mac/scoped_nsobject.h"
 #include "base/message_loop/message_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/prefs/pref_member.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/testing_pref_service.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_switch_item.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_controller.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_controller_test.h"
 #include "ios/chrome/browser/voice/speech_input_locale_config_impl.h"
 #include "ios/public/provider/chrome/browser/voice/voice_search_prefs.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 class VoicesearchCollectionViewControllerTest
     : public CollectionViewControllerTest {
  protected:
   void SetUp() override {
     CollectionViewControllerTest::SetUp();
     pref_service_ = CreateLocalState();
   }
 
-  CollectionViewController* NewController() override NS_RETURNS_RETAINED {
+  CollectionViewController* InstantiateController() override {
     return [[VoicesearchCollectionViewController alloc]
         initWithPrefs:pref_service_.get()];
   }
 
   std::unique_ptr<PrefService> CreateLocalState() {
     TestingPrefServiceSimple* prefs = new TestingPrefServiceSimple();
     PrefRegistrySimple* registry = prefs->registry();
     registry->RegisterBooleanPref(prefs::kVoiceSearchTTS, false);
     registry->RegisterStringPref(prefs::kVoiceSearchLocale, "en-US");
     return std::unique_ptr<PrefService>(prefs);
@@ skipping 88 matching lines @@
   textToSpeechEnabled.Init(prefs::kVoiceSearchTTS, pref_service_.get());
   textToSpeechEnabled.SetValue(true);
 
   CreateController();
   CollectionViewSwitchItem* switchItem = GetCollectionViewItem(0, 0);
   EXPECT_TRUE(switchItem.isOn);
   EXPECT_FALSE(switchItem.isEnabled);
 }
 
 }  // namespace