PaymentRequest: Introduce PaymentMethodData.

chrome/test/data/android/payments/free_shipping.js

 /*
  * 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.
  */
 
 /* global PaymentRequest:false */
 /* global toDictionary:false */
 
 /**
  * Launches the PaymentRequest UI that offers free shipping worldwide.
  */
 function buy() {  // eslint-disable-line no-unused-vars
   try {
     var request = new PaymentRequest(
-        ['visa'], {
+        [{supportedMethods: ['visa']}], {
           items: [{
             id: 'total',
             label: 'Total',
             amount: {currency: 'USD', value: '5.00'}
           }],
           shippingOptions: [{
             id: 'freeShippingOption',
             label: 'Free global shipping',
             amount: {currency: 'USD', value: '0'}
           }]
@@ skipping 14 matching lines @@
                 print(error.message);
               });
         })
         .catch(function(error) {
           print(error.message);
         });
   } catch (error) {
     print(error.message);
   }
 }