[Payments] Record CanMakePayment metrics on Desktop.

chrome/browser/payments/chrome_payment_request_delegate.cc

Index: chrome/browser/payments/chrome_payment_request_delegate.cc
diff --git a/chrome/browser/payments/chrome_payment_request_delegate.cc b/chrome/browser/payments/chrome_payment_request_delegate.cc
index f4b82c29a9750526382024361de60b61f731c8df..6f1ee4f4bff0e42b6eeae70bf133bd70d9e548bc 100644
--- a/chrome/browser/payments/chrome_payment_request_delegate.cc
+++ b/chrome/browser/payments/chrome_payment_request_delegate.cc
@@ -184,4 +184,8 @@ AddressNormalizer* ChromePaymentRequestDelegate::GetAddressNormalizer() {
   return &address_normalizer_;
 }
 
+ukm::UkmService* ChromePaymentRequestDelegate::GetUkmService() {
+  return g_browser_process->ukm_service();
+}
+
 }  // namespace payments