Remove PaymentResponse.totalAmount according to latest spec

third_party/WebKit/public/platform/modules/payments/payment_request.mojom

 // 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.
 
 [JavaPackage="org.chromium.mojom.payments"]
 module blink.mojom;
 
 // The shipping address that the browser process provides to the renderer
 // process. Built either by the browser or a payment app.
 struct PaymentAddress {
@@ skipping 28 matching lines @@
   // ISO 4217 currency code. Three upper case ASCII letters.
   string currency;
 
   // ISO 20022 CurrencyAnd30Amount. Up to 30 total digits. Up to 10 fraction
   // digits. Separated by a dot.
   string value;
 };
 
 struct PaymentResponse {
   string method_name;
-  PaymentCurrencyAmount total_amount;
 
   // Payment method specific JSON string that is built either by the browser or
   // a payment app, for example Android Pay. Browser ensures that the string can
   // be successfully parsed into base::JSONParser. Renderer parses this string
   // via v8::JSON::Parse() and hands off the result to the merchant website.
   // There's no one format for this object, so richer types cannot be used. A
   // simple example:
   //
   // {"nameOnCard": "Jon Doe", "pan": "4111 1111 1111 1111"}
   string stringified_details;
@@ skipping 59 matching lines @@
 
 interface PaymentRequest {
   SetClient(PaymentRequestClient client);
   Show(array<PaymentMethodData> methodData,
        PaymentDetails details,
        PaymentOptions options);
   UpdateWith(PaymentDetails details);
   Abort();
   Complete(PaymentComplete result);
 };