Error out when merchant requests only unknown payment methods.

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

Index: chrome/test/data/android/payments/bobpay.js
diff --git a/chrome/test/data/android/payments/no_shipping.js b/chrome/test/data/android/payments/bobpay.js
similarity index 60%
copy from chrome/test/data/android/payments/no_shipping.js
copy to chrome/test/data/android/payments/bobpay.js
index 354fc9acb42acf1278770db823a78d67bd54fe23..0ac7deffae5fa3cc02a689b18bf454777c10bdc7 100644
--- a/chrome/test/data/android/payments/no_shipping.js
+++ b/chrome/test/data/android/payments/bobpay.js
@@ -7,29 +7,28 @@
 /* global PaymentRequest:false */
 
 /**
- * Launches the PaymentRequest UI that does not require a shipping address.
+ * Launches the PaymentRequest UI with Bob Pay as the only payment method.
  */
 function buy() {  // eslint-disable-line no-unused-vars
   try {
     new PaymentRequest(
-        [{supportedMethods: ['visa', 'mastercard']}],
+        [{supportedMethods: ['https://bobpay.com']}],
         {total: {label: 'Total', amount: {currency: 'USD', value: '5.00'}}})
         .show()
         .then(function(resp) {
           resp.complete('success')
               .then(function() {
-                print(
-                    resp.methodName + '<br>' +
-                    JSON.stringify(resp.details, undefined, 2));
+                print(resp.methodName + '<br>' +
+                      JSON.stringify(resp.details, undefined, 2));
               })
               .catch(function(error) {
-                print(error);
+                print('complete() rejected<br>' + error.message);
               });
         })
         .catch(function(error) {
-          print(error);
+          print('show() rejected<br>' + error.message);
         });
   } catch (error) {
-    print(error.message);
+    print('exception thrown<br>' + error.message);
   }
 }