PaymentHandler: Stop using GetAllManifests() in content side tests.

content/test/data/payments/payment_app_invocation.html

Index: content/test/data/payments/payment_app_invocation.html
diff --git a/content/test/data/payments/payment_app_invocation.html b/content/test/data/payments/payment_app_invocation.html
index 64c9836c53924743062d5adcc402f1ff4c258ce5..a09e096aefbdc7b37d3fbe86e778821def37124a 100644
--- a/content/test/data/payments/payment_app_invocation.html
+++ b/content/test/data/payments/payment_app_invocation.html
@@ -9,15 +9,9 @@ function registerPaymentApp() {
         return navigator.serviceWorker.ready;
       })
     .then(registration => {
-        return registration.paymentManager.setManifest({
-            name: 'Payment App',
-            icon: 'payment-app-icon',
-            options: [{
-              name: 'Visa ****',
-              icon: 'payment-app-icon',
-              id: 'payment-app-id',
-              enabledMethods: ['visa']
-            }]
+        return registration.paymentManager.instruments.set('payment-app-id', {
+            name: 'Visa ****',
+            enabledMethods: ['visa']
           });
       })
     .then(result => {