Remove PaymentResponse.totalAmount according to latest spec

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 */
 
 /**
@@ skipping 10 matching lines @@
             amount: {currency: 'USD', value: '0'},
             selected: true
           }]
         },
         {requestShipping: true});
     request.show()
         .then(function(resp) {
           resp.complete('success')
               .then(function() {
                 print(
-                    JSON.stringify(resp.totalAmount, undefined, 2) + '<br>' +
                     resp.shippingOption + '<br>' +
                     JSON.stringify(
                         toDictionary(resp.shippingAddress), undefined, 2) +
                     '<br>' + 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);
   }
 }