PaymentRequest: The currencySystem should be non-nullable.

third_party/WebKit/Source/modules/payments/PaymentRequest.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/payments/PaymentRequest.h"
 
 #include "bindings/core/v8/ConditionalFeatures.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
@@ skipping 46 matching lines @@
 
 namespace mojo {
 
 template <>
 struct TypeConverter<PaymentCurrencyAmountPtr, blink::PaymentCurrencyAmount> {
   static PaymentCurrencyAmountPtr Convert(
       const blink::PaymentCurrencyAmount& input) {
     PaymentCurrencyAmountPtr output = PaymentCurrencyAmount::New();
     output->currency = input.currency();
     output->value = input.value();
-    if (input.hasCurrencySystem())
-      output->currency_system = input.currencySystem();
+    output->currency_system = input.currencySystem();
     return output;
   }
 };
 
 template <>
 struct TypeConverter<PaymentItemPtr, blink::PaymentItem> {
   static PaymentItemPtr Convert(const blink::PaymentItem& input) {
     PaymentItemPtr output = payments::mojom::blink::PaymentItem::New();
     output->label = input.label();
     output->amount = PaymentCurrencyAmount::From(input.amount());
@@ skipping 958 matching lines @@
   m_completeResolver.clear();
   m_showResolver.clear();
   m_abortResolver.clear();
   m_canMakePaymentResolver.clear();
   if (m_clientBinding.is_bound())
     m_clientBinding.Close();
   m_paymentProvider.reset();
 }
 
 }  // namespace blink