Verify behavior of PaymentRequest constructor.

third_party/WebKit/Source/modules/payments/PaymentsValidators.h

Index: third_party/WebKit/Source/modules/payments/PaymentsValidators.h
diff --git a/third_party/WebKit/Source/modules/payments/PaymentsValidators.h b/third_party/WebKit/Source/modules/payments/PaymentsValidators.h
index c391a1e2bfcecee5ed4ec53297cf2fa8efb7ad12..100d799a9892a97b5f61b7ee2f7ffdf39083882a 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentsValidators.h
+++ b/third_party/WebKit/Source/modules/payments/PaymentsValidators.h
@@ -30,6 +30,7 @@ class MODULES_EXPORT PaymentsValidators final {
   // Returns true if |amount| is a valid currency code as defined in ISO 20022
   // CurrencyAnd30Amount.
   static bool IsValidAmountFormat(const String& amount,
+                                  const String& item_name,
                                   String* optional_error_message);
 
   // Returns true if |code| is a valid ISO 3166 country code.