Clean up PaymentRequest integration tests.

chrome/test/data/android/payments/no_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 */
+
+/**
+ * Launches the PaymentRequest UI that does not require a shipping address.
+ */
+function buy() {  // eslint-disable-line no-unused-vars
+  try {
+    new PaymentRequest(['visa'], {
+      items: [{
+        id: 'total',
+        label: 'Total',
+        amount: {currency: 'USD', value: '5.00'}
+      }]
+    })
+        .show()
+        .then(function(resp) {
+          resp.complete(true)
+              .then(function() {
+                print(
+                    resp.methodName + '<br>' +
+                    JSON.stringify(resp.details, undefined, 2));
+              })
+              .catch(function(error) {
+                print(error.message);
+              });
+        })
+        .catch(function(error) {
+          print(error.message);
+        });
+  } catch (error) {
+    print(error.message);
+  }
+}