PaymentApp: Remove scope_url parameter from Get/SetManifest methods.

components/payments/payment_app.mojom

Index: components/payments/payment_app.mojom
diff --git a/components/payments/payment_app.mojom b/components/payments/payment_app.mojom
index 6959aa7ac84576c38ebb222f42412de45b5b1ebd..a12d53bd3af3dbb9ec9690232ca9fe38aa8822ba 100644
--- a/components/payments/payment_app.mojom
+++ b/components/payments/payment_app.mojom
@@ -25,8 +25,9 @@ struct PaymentAppManifest {
 };
 
 interface PaymentAppManager {
-  SetManifest(string service_worker_scope, PaymentAppManifest payment_app_manifest)
+  Init(string service_worker_scope);
+  SetManifest(PaymentAppManifest payment_app_manifest)
       => (PaymentAppManifestError error);
-  GetManifest(string service_worker_scope)
+  GetManifest()
       => (PaymentAppManifest payment_app_manifest, PaymentAppManifestError error);
 };