[PaymentApp] Fix a crash when enabledMethods called.

third_party/WebKit/Source/modules/payments/PaymentAppManager.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/PaymentAppManager.h"
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/DOMException.h"
 #include "modules/payments/PaymentAppManifest.h"
@@ skipping 10 matching lines @@
 using payments::mojom::blink::PaymentAppOption;
 using payments::mojom::blink::PaymentAppOptionPtr;
 
 template <>
 struct TypeConverter<PaymentAppOptionPtr, blink::PaymentAppOption> {
   static PaymentAppOptionPtr Convert(const blink::PaymentAppOption& input) {
     PaymentAppOptionPtr output = PaymentAppOption::New();
     output->name = input.hasName() ? input.name() : WTF::emptyString();
     output->icon = input.hasIcon() ? input.icon() : WTF::String();
     output->id = input.hasId() ? input.id() : WTF::emptyString();
-    output->enabled_methods = WTF::Vector<WTF::String>(input.enabledMethods());
+    if (input.hasEnabledMethods()) {
+      output->enabled_methods =
+          WTF::Vector<WTF::String>(input.enabledMethods());
+    }
     return output;
   }
 };
 
 template <>
 struct TypeConverter<PaymentAppManifestPtr, blink::PaymentAppManifest> {
   static PaymentAppManifestPtr Convert(const blink::PaymentAppManifest& input) {
     PaymentAppManifestPtr output = PaymentAppManifest::New();
     output->name = input.hasName() ? input.name() : WTF::emptyString();
     output->icon = input.hasIcon() ? input.icon() : WTF::String();
@@ skipping 150 matching lines @@
 
 void PaymentAppManager::onServiceConnectionError() {
   if (!Platform::current()) {
     return;
   }
 
   m_manager.reset();
 }
 
 }  // namespace blink