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

ios/chrome/browser/ui/settings/clear_browsing_data_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/clear_browsing_data_collection_view_controller.h"
 
 #include <memory>
 
 #include "base/ios/ios_util.h"
 #include "base/mac/foundation_util.h"
@@ skipping 20 matching lines @@
 #include "ios/chrome/browser/sync/ios_chrome_profile_sync_test_util.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_text_item.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_controller_test.h"
 #import "ios/chrome/common/string_util.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ios/web/public/test/test_web_thread_bundle.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
+
 using testing::Return;
 
 @interface ClearBrowsingDataCollectionViewController (ExposedForTesting)
 - (NSString*)getCounterTextFromResult:
     (const browsing_data::BrowsingDataCounter::Result&)result;
 @end
 
 namespace {
 
 enum ItemEnum {
@@ skipping 31 matching lines @@
   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());
     RegisterBrowserStatePrefs(registry.get());
     return prefs;
   }
 
-  CollectionViewController* NewController() override {
+  CollectionViewController* InstantiateController() override {
     return [[ClearBrowsingDataCollectionViewController alloc]
         initWithBrowserState:browser_state_.get()];
   }
 
   void SelectItem(int item, int section) {
     NSIndexPath* indexPath =
         [NSIndexPath indexPathForItem:item inSection:section];
     [controller() collectionView:[controller() collectionView]
         didSelectItemAtIndexPath:indexPath];
   }
@@ skipping 194 matching lines @@
           controller());
   for (const TestCase& test_case : kTestCases) {
     browsing_data::BrowsingDataCounter::FinishedResult result(
         &counter, test_case.cache_size);
     NSString* output = [viewController getCounterTextFromResult:result];
     EXPECT_NSEQ(test_case.expected_output, output);
   }
 }
 
 }  // namespace