[Payment Request] Unit tests for incomplete shipping/billing address selection

ios/chrome/browser/payments/test_payment_request.mm

Index: ios/chrome/browser/payments/test_payment_request.mm
diff --git a/ios/chrome/browser/payments/test_payment_request.mm b/ios/chrome/browser/payments/test_payment_request.mm
index 336d45fc41e91b1223dc1a99b13b052be11d6851..be46d8a30b2423434ffa8c5f8ad771db6d06e9f9 100644
--- a/ios/chrome/browser/payments/test_payment_request.mm
+++ b/ios/chrome/browser/payments/test_payment_request.mm
@@ -26,9 +26,13 @@ void TestPaymentRequest::ClearCreditCards() {
 }
 
 autofill::RegionDataLoader* TestPaymentRequest::GetRegionDataLoader() {
-  return region_data_loader_;
+  if (region_data_loader_)
+    return region_data_loader_;
+  return PaymentRequest::GetRegionDataLoader();
 }
 
 payments::PaymentsProfileComparator* TestPaymentRequest::profile_comparator() {
-  return profile_comparator_;
+  if (profile_comparator_)
+    return profile_comparator_;
+  return PaymentRequest::profile_comparator();
 }