[Web Payments] Add data attribution string to dialog

components/payments/content/payment_response_helper.cc

Index: components/payments/content/payment_response_helper.cc
diff --git a/components/payments/content/payment_response_helper.cc b/components/payments/content/payment_response_helper.cc
index 9a3a8e5e8766041baaae1845d9b8f36913d9ae64..420fb4309dbe03831d47e33ca6f1a3459916fdcf 100644
--- a/components/payments/content/payment_response_helper.cc
+++ b/components/payments/content/payment_response_helper.cc
@@ -4,6 +4,8 @@
 
 #include "components/payments/content/payment_response_helper.h"
 
+#include <string>
+
 #include "base/strings/string_split.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/autofill/core/browser/autofill_country.h"
@@ -61,9 +63,9 @@ PaymentResponseHelper::PaymentResponseHelper(
   // Start to get the instrument details. Will call back into
   // OnInstrumentDetailsReady.
   selected_instrument_->InvokePaymentApp(this);
-};
+}
 
-PaymentResponseHelper::~PaymentResponseHelper(){};
+PaymentResponseHelper::~PaymentResponseHelper() {}
 
 // static
 mojom::PaymentAddressPtr
@@ -185,6 +187,7 @@ void PaymentResponseHelper::GeneratePaymentResponse() {
   }
 
   delegate_->OnPaymentResponseReady(std::move(payment_response));
+  payment_request_delegate_->MarkFirstTransactionAsCompleted();
 }
 
 }  // namespace payments