Provide skeleton functionality for AppCache handling in the network service.

content/browser/appcache/appcache_job.cc

 // Copyright (c) 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.
 
 #include "content/browser/appcache/appcache_job.h"
 
 #include "base/command_line.h"
 #include "content/browser/appcache/appcache_request.h"
 #include "content/browser/appcache/appcache_url_loader_job.h"
 #include "content/browser/appcache/appcache_url_request_job.h"
@@ skipping 24 matching lines @@
 AppCacheJob::~AppCacheJob() {}
 
 base::WeakPtr<AppCacheJob> AppCacheJob::GetWeakPtr() {
   return weak_factory_.GetWeakPtr();
 }
 
 net::URLRequestJob* AppCacheJob::AsURLRequestJob() {
   return nullptr;
 }
 
+AppCacheURLLoaderJob* AppCacheJob::AsURLLoaderJob() {
+  return nullptr;
+}
+
 AppCacheJob::AppCacheJob() : weak_factory_(this) {}
 
 }  // namespace content