Remove the dependence on BrowserThread::FILE for

net/tools/net_watcher/net_watcher.cc

 // Copyright (c) 2012 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.
 
 // This is a small utility that watches for and logs network changes.
 // It prints out the current network connection type and proxy configuration
 // upon startup and then prints out changes as they happen.
 // It's useful for testing NetworkChangeNotifier and ProxyConfigService.
 // The only command line option supported is --ignore-netif which is followed
 // by a comma seperated list of network interfaces to ignore when computing
@@ skipping 163 matching lines @@
   std::unique_ptr<net::NetworkChangeNotifier> network_change_notifier(
       new net::NetworkChangeNotifierLinux(ignored_interfaces));
 #else
   std::unique_ptr<net::NetworkChangeNotifier> network_change_notifier(
       net::NetworkChangeNotifier::Create());
 #endif
 
   // Use the network loop as the file loop also.
   std::unique_ptr<net::ProxyConfigService> proxy_config_service(
       net::ProxyService::CreateSystemProxyConfigService(
-          network_loop.task_runner(), network_loop.task_runner()));
+          network_loop.task_runner()));
 
   // Uses |network_change_notifier|.
   net::NetworkChangeNotifier::AddIPAddressObserver(&net_watcher);
   net::NetworkChangeNotifier::AddConnectionTypeObserver(&net_watcher);
   net::NetworkChangeNotifier::AddDNSObserver(&net_watcher);
   net::NetworkChangeNotifier::AddNetworkChangeObserver(&net_watcher);
 
   proxy_config_service->AddObserver(&net_watcher);
 
   LOG(INFO) << "Initial connection type: "
@@ skipping 17 matching lines @@
   proxy_config_service->RemoveObserver(&net_watcher);
 
   // Uses |network_change_notifier|.
   net::NetworkChangeNotifier::RemoveDNSObserver(&net_watcher);
   net::NetworkChangeNotifier::RemoveConnectionTypeObserver(&net_watcher);
   net::NetworkChangeNotifier::RemoveIPAddressObserver(&net_watcher);
   net::NetworkChangeNotifier::RemoveNetworkChangeObserver(&net_watcher);
 
   return 0;
 }