[Payments] Record CanMakePayment metrics on Desktop.

components/payments/core/autofill_payment_instrument_unittest.cc

Index: components/payments/core/autofill_payment_instrument_unittest.cc
diff --git a/components/payments/core/autofill_payment_instrument_unittest.cc b/components/payments/core/autofill_payment_instrument_unittest.cc
index 6735be8965bd719434bf503f7138fd79574b5975..de25e9bef30ce1a86ece61b71375832f4fcc72f2 100644
--- a/components/payments/core/autofill_payment_instrument_unittest.cc
+++ b/components/payments/core/autofill_payment_instrument_unittest.cc
@@ -125,6 +125,8 @@ class FakePaymentRequestDelegate : public PaymentRequestDelegate {
 
   autofill::RegionDataLoader* GetRegionDataLoader() override { return nullptr; }
 
+  ukm::UkmService* GetUkmService() override { return nullptr; }
+
  private:
   std::string locale_;
   const GURL last_committed_url_;