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

ios/chrome/browser/ui/settings/autofill_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/autofill_collection_view_controller.h"
 
 #include "base/guid.h"
 #include "base/mac/foundation_util.h"
 #include "base/strings/utf_string_conversions.h"
 #import "base/test/ios/wait_util.h"
 #include "components/autofill/core/browser/autofill_profile.h"
 #include "components/autofill/core/browser/credit_card.h"
 #include "components/autofill/core/browser/personal_data_manager.h"
 #include "ios/chrome/browser/autofill/personal_data_manager_factory.h"
 #include "ios/chrome/browser/browser_state/test_chrome_browser_state.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_controller_test.h"
 #include "ios/chrome/browser/ui/settings/personal_data_manager_data_changed_observer.h"
 #include "ios/web/public/test/test_web_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 @interface SettingsRootCollectionViewController (ExposedForTesting)
 - (void)editButtonPressed;
 @end
 
 namespace {
 
 class AutofillCollectionViewControllerTest
     : public CollectionViewControllerTest {
  protected:
   AutofillCollectionViewControllerTest() {
     TestChromeBrowserState::Builder test_cbs_builder;
     chrome_browser_state_ = test_cbs_builder.Build();
     // Profile import requires a PersonalDataManager which itself needs the
     // WebDataService; this is not initialized on a TestChromeBrowserState by
     // default.
     chrome_browser_state_->CreateWebDataService();
   }
 
-  CollectionViewController* NewController() override NS_RETURNS_RETAINED {
+  CollectionViewController* InstantiateController() override {
     return [[AutofillCollectionViewController alloc]
         initWithBrowserState:chrome_browser_state_.get()];
   }
 
   void AddProfile(const std::string& origin,
                   const std::string& name,
                   const std::string& address) {
     autofill::PersonalDataManager* personal_data_manager =
         autofill::PersonalDataManagerFactory::GetForBrowserState(
             chrome_browser_state_.get());
@@ skipping 99 matching lines @@
 
   // Exit 'edit' mode.
   [view_controller editButtonPressed];
 
   // Verify the resulting UI.
   EXPECT_EQ(1, NumberOfSections());
   EXPECT_EQ(2, NumberOfItemsInSection(0));
 }
 
 }  // namespace