[Payments] Use PaymentInstrument/AutofillPaymentInstrument throughout.

components/payments/content/payment_request_spec.cc

Index: components/payments/content/payment_request_spec.cc
diff --git a/components/payments/content/payment_request_spec.cc b/components/payments/content/payment_request_spec.cc
index 3d3211204c8199585714b466049d8bd3344d3bbb..5a92e86c71cc40d7986e3e1b941299e3bf3bb8fa 100644
--- a/components/payments/content/payment_request_spec.cc
+++ b/components/payments/content/payment_request_spec.cc
@@ -124,6 +124,9 @@ void PaymentRequestSpec::PopulateValidatedMethodData(
       }
     }
   }
+
+  supported_card_networks_set_.insert(supported_card_networks_.begin(),
+                                      supported_card_networks_.end());
 }
 
 void PaymentRequestSpec::NotifyOnInvalidSpecProvided() {