PaymentRequest: The currencySystem should be non-nullable.

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

Index: third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
diff --git a/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp b/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
index 62906ae9686b6e096316eeb408acdf8c39c394d8..8db8b267520538f561aaf16566695fa8d4c8c105 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
+++ b/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
@@ -64,8 +64,7 @@ struct TypeConverter<PaymentCurrencyAmountPtr, blink::PaymentCurrencyAmount> {
     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;
   }
 };