[ObjC ARC] Converts ios/chrome/browser/payments: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"
 #include "components/autofill/core/browser/test_personal_data_manager.h"
 #import "ios/chrome/browser/payments/cells/payment_method_item.h"
 #import "ios/chrome/browser/payments/cells/payments_text_item.h"
 #include "ios/chrome/browser/payments/payment_request.h"
 #import "ios/chrome/browser/payments/payment_request_test_util.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_controller_test.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ios/web/public/payments/payment_request.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 class PaymentMethodSelectionViewControllerTest
     : public CollectionViewControllerTest {
  protected:
   CollectionViewController* NewController() override NS_RETURNS_RETAINED {
     personal_data_manager_ =
         base::MakeUnique<autofill::TestPersonalDataManager>();
     // Add testing credit cards. autofill::TestPersonalDataManager does not take
     // ownership of the cards.
     credit_card1_ = payment_request_test_util::CreateTestCreditCard();
     personal_data_manager_->AddTestingCreditCard(credit_card1_.get());
@@ skipping 47 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]]);
 }