PaymentApp: Implement respondWith() in PaymentRequestEvent. (content side)

chrome/browser/android/payments/service_worker_payment_app_bridge.cc

 // 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.
 
 #include "chrome/browser/android/payments/service_worker_payment_app_bridge.h"
 
 #include <utility>
 
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
@@ skipping 151 matching lines @@
     modifier->method_data->stringified_data = ConvertJavaStringToUTF8(
         env,
         Java_ServiceWorkerPaymentAppBridge_getStringifiedDataFromMethodData(
             env, jmodifier_method_data));
 
     app_request->modifiers.push_back(std::move(modifier));
   }
 
   content::PaymentAppProvider::GetInstance()->InvokePaymentApp(
       web_contents->GetBrowserContext(), registration_id,
-      std::move(app_request));
+      std::move(app_request),
+      content::PaymentAppProvider::InvokePaymentAppCallback());
 }
 
 bool RegisterServiceWorkerPaymentAppBridge(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }