Allow duplicate payment method identifiers.

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 495f73e805dc13310cd77b78dbb345844168c341..50029d323bdf717e491337a84dd95309cfa5aaa5 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
+++ b/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
@@ -96,8 +96,6 @@ struct TypeConverter<PaymentDetailsModifierPtr, blink::PaymentDetailsModifier> {
 
     if (input.hasTotal())
       output->total = PaymentItem::From(input.total());
-    else
-      output->total = PaymentItem::New();
 
     if (input.hasAdditionalDisplayItems()) {
       for (size_t i = 0; i < input.additionalDisplayItems().size(); ++i) {
@@ -273,7 +271,6 @@ void validatePaymentDetailsModifiers(
     return;
   }
 
-  HashSet<String> uniqueMethods;
   for (const auto& modifier : modifiers) {
     if (modifier.supportedMethods().isEmpty()) {
       exceptionState.throwTypeError(
@@ -281,15 +278,6 @@ void validatePaymentDetailsModifiers(
       return;
     }
 
-    for (const auto& method : modifier.supportedMethods()) {
-      if (uniqueMethods.contains(method)) {
-        exceptionState.throwTypeError(
-            "Duplicate payment method identifiers are not allowed");
-        return;
-      }
-      uniqueMethods.add(method);
-    }
-
     if (modifier.hasTotal()) {
       validateShippingOptionOrPaymentItem(modifier.total(), exceptionState);
       if (exceptionState.hadException())
@@ -368,7 +356,6 @@ void validateAndConvertPaymentMethodData(
     return;
   }
 
-  HashSet<String> uniqueMethods;
   for (const auto& pmd : paymentMethodData) {
     if (pmd.supportedMethods().isEmpty()) {
       exceptionState.throwTypeError(
@@ -376,15 +363,6 @@ void validateAndConvertPaymentMethodData(
       return;
     }
 
-    for (const auto& method : pmd.supportedMethods()) {
-      if (uniqueMethods.contains(method)) {
-        exceptionState.throwTypeError(
-            "Duplicate payment method identifiers are not allowed");
-        return;
-      }
-      uniqueMethods.add(method);
-    }
-
     String stringifiedData = "";
     if (pmd.hasData() && !pmd.data().isEmpty()) {
       std::unique_ptr<JSONValue> value =