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

ios/chrome/browser/payments/payment_method_selection_view_controller_unittest.mm

 // Copyright 2017 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/payments/payment_method_selection_view_controller.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/memory/ptr_util.h"
 #include "components/autofill/core/browser/autofill_test_utils.h"
 #include "components/autofill/core/browser/credit_card.h"
@@ skipping 21 matching lines @@
         credit_card2_(autofill::test::GetCreditCard2()) {
     // Add testing profile and credit cards to
     // autofill::TestPersonalDataManager.
     personal_data_manager_.AddTestingProfile(&autofill_profile_);
     credit_card1_.set_billing_address_id(autofill_profile_.guid());
     personal_data_manager_.AddTestingCreditCard(&credit_card1_);
     credit_card2_.set_billing_address_id(autofill_profile_.guid());
     personal_data_manager_.AddTestingCreditCard(&credit_card2_);
   }
 
-  CollectionViewController* NewController() override NS_RETURNS_RETAINED {
+  CollectionViewController* InstantiateController() override {
     payment_request_ = base::MakeUnique<PaymentRequest>(
         payment_request_test_util::CreateTestWebPaymentRequest(),
         &personal_data_manager_);
 
     return [[PaymentMethodSelectionViewController alloc]
         initWithPaymentRequest:payment_request_.get()];
   }
 
   PaymentMethodSelectionViewController*
   GetPaymentMethodSelectionViewController() {
@@ skipping 32 matching lines @@
   item = GetCollectionViewItem(0, 1);
   EXPECT_TRUE([item isMemberOfClass:[PaymentMethodItem class]]);
   payment_method_item = item;
   EXPECT_EQ(MDCCollectionViewCellAccessoryNone,
             payment_method_item.accessoryType);
 
   // The last item should be of type TextAndMessageItem.
   item = GetCollectionViewItem(0, 2);
   EXPECT_TRUE([item isMemberOfClass:[PaymentsTextItem class]]);
 }