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

ios/chrome/browser/ui/settings/sync_encryption_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/sync_encryption_collection_view_controller.h"
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ptr_util.h"
 #include "components/browser_sync/profile_sync_service_mock.h"
 #include "components/strings/grit/components_strings.h"
 #include "ios/chrome/browser/browser_state/test_chrome_browser_state.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"
 #import "ios/chrome/browser/ui/collection_view/collection_view_controller_test.h"
 #import "ios/chrome/browser/ui/settings/cells/encryption_item.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ios/web/public/test/test_web_thread_bundle.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #import "testing/gtest_mac.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 using testing::NiceMock;
 using testing::Return;
 
 std::unique_ptr<KeyedService> CreateNiceProfileSyncServiceMock(
     web::BrowserState* context) {
   browser_sync::ProfileSyncService::InitParams init_params =
       CreateProfileSyncServiceParamsForTest(
           nullptr, ios::ChromeBrowserState::FromBrowserState(context));
@@ skipping 17 matching lines @@
             IOSChromeProfileSyncServiceFactory::GetForBrowserState(
                 chrome_browser_state_.get()));
     ON_CALL(*mock_profile_sync_service_, IsEngineInitialized())
         .WillByDefault(Return(true));
     ON_CALL(*mock_profile_sync_service_, IsUsingSecondaryPassphrase())
         .WillByDefault(Return(true));
 
     CreateController();
   }
 
-  CollectionViewController* NewController() override NS_RETURNS_RETAINED {
+  CollectionViewController* InstantiateController() override {
     return [[SyncEncryptionCollectionViewController alloc]
         initWithBrowserState:chrome_browser_state_.get()];
   }
 
   web::TestWebThreadBundle thread_bundle_;
   std::unique_ptr<TestChromeBrowserState> chrome_browser_state_;
   // Weak, owned by |chrome_browser_state_|.
   browser_sync::ProfileSyncServiceMock* mock_profile_sync_service_;
 };
 
 TEST_F(SyncEncryptionCollectionViewControllerTest, TestModel) {
   CheckController();
   CheckTitleWithId(IDS_IOS_SYNC_ENCRYPTION_TITLE);
 
   EXPECT_EQ(2, NumberOfSections());
 
   NSInteger const kSection = 0;
   EXPECT_EQ(2, NumberOfItemsInSection(kSection));
 
   EncryptionItem* accountItem = GetCollectionViewItem(kSection, 0);
   EXPECT_NSEQ(l10n_util::GetNSString(IDS_SYNC_BASIC_ENCRYPTION_DATA),
               accountItem.text);
 
   EncryptionItem* passphraseItem = GetCollectionViewItem(kSection, 1);
   EXPECT_NSEQ(l10n_util::GetNSString(IDS_SYNC_FULL_ENCRYPTION_DATA),
               passphraseItem.text);
 }
 
 }  // namespace