[Payments] Pass stringified details for service worker based payment app response

content/renderer/service_worker/service_worker_context_client.cc

Index: content/renderer/service_worker/service_worker_context_client.cc
diff --git a/content/renderer/service_worker/service_worker_context_client.cc b/content/renderer/service_worker/service_worker_context_client.cc
index f181da5c2618be053c1e67c56ed03a0157a5f21a..3db1cf81460c105aa474848fddf55db0b01a57ca 100644
--- a/content/renderer/service_worker/service_worker_context_client.cc
+++ b/content/renderer/service_worker/service_worker_context_client.cc
@@ -1067,6 +1067,7 @@ void ServiceWorkerContextClient::RespondToPaymentRequestEvent(
   payments::mojom::PaymentAppResponsePtr response =
       payments::mojom::PaymentAppResponse::New();
   response->method_name = web_response.method_name.Utf8();
+  response->stringified_details = web_response.stringified_details.Utf8();
   response_callback->OnPaymentAppResponse(
       std::move(response), base::Time::FromDoubleT(dispatch_event_time));
   context_->payment_response_callbacks.erase(payment_request_id);