Add a stub implementation of the URLLoaderFactory for AppCache.

content/browser/loader/navigation_url_loader_network_service.h

 // Copyright 2017 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.
 
 #ifndef CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_NETWORK_SERVICE_H_
 #define CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_NETWORK_SERVICE_H_
 
 #include "base/macros.h"
 #include "content/browser/loader/navigation_url_loader.h"
 #include "content/common/url_loader.mojom.h"
@@ skipping 50 matching lines @@
 
  private:
   NavigationURLLoaderDelegate* delegate_;
 
   mojo::Binding<mojom::URLLoaderClient> binding_;
   std::unique_ptr<NavigationRequestInfo> request_info_;
   mojom::URLLoaderAssociatedPtr url_loader_associated_ptr_;
   scoped_refptr<ResourceResponse> response_;
   SSLStatus ssl_status_;
 
+  // Request ID for browser initiated requests. We start at -2 on the same lines
+  // ResourceDispatcherHostImpl.
+  int request_id_;
+
   DISALLOW_COPY_AND_ASSIGN(NavigationURLLoaderNetworkService);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_NETWORK_SERVICE_H_