Implement dumb URLLoader{Factory} for ServiceWorker script loading (for try)

content/common/service_worker/service_worker.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.
 
 module content.mojom;
 
 import "content/common/service_worker/service_worker_provider.mojom";
 
 // Per-process browser-side interface.
 // The renderer uses this interface to tell the browser when potential service
 // worker clients are created and when service workers are starting up.
 interface ServiceWorkerDispatcherHost {
   // Creates a content::ServiceWorkerProviderHost on the browser
   // process. |provider_info| has Mojo endpoints to connect the provider host
   // and the provider on the renderer together. The lifetime of
   // ServiceWorkerProviderHost will be tied to the
   // mojom::ServiceWorkerProviderHost interface.
   OnProviderCreated(ServiceWorkerProviderHostInfo provider_info);
-
-  // Informs the browser that a service worker is starting up. |provider_id|
-  // identifies the ServiceWorkerProviderHost hosting the service
-  // worker. |version_id| identifies the ServiceWorkerVersion and
-  // |embedded_worker_id| identifies the EmbeddedWorkerInstance.  
-  OnSetHostedVersionId(int32 provider_id,
-                       int64 version_id,
-                       int32 embedded_worker_id);
 };