Remove the dependence on BrowserThread::FILE for

content/shell/browser/shell_url_request_context_getter.cc

 // Copyright 2013 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/shell/browser/shell_url_request_context_getter.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 77 matching lines @@
     bool ignore_certificate_errors,
     const base::FilePath& base_path,
     scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> file_task_runner,
     ProtocolHandlerMap* protocol_handlers,
     URLRequestInterceptorScopedVector request_interceptors,
     net::NetLog* net_log)
     : ignore_certificate_errors_(ignore_certificate_errors),
       base_path_(base_path),
       io_task_runner_(std::move(io_task_runner)),
-      file_task_runner_(std::move(file_task_runner)),
       net_log_(net_log),
       request_interceptors_(std::move(request_interceptors)) {
   // Must first be created on the UI thread.
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   std::swap(protocol_handlers_, *protocol_handlers);
 
   // We must create the proxy config service on the UI loop on Linux because it
   // must synchronously run on the glib message loop. This will be passed to
   // the URLRequestContextStorage on the IO thread in GetURLRequestContext().
   proxy_config_service_ = GetProxyConfigService();
 }
 
 ShellURLRequestContextGetter::~ShellURLRequestContextGetter() {
 }
 
 std::unique_ptr<net::NetworkDelegate>
 ShellURLRequestContextGetter::CreateNetworkDelegate() {
   return base::WrapUnique(new ShellNetworkDelegate);
 }
 
 std::unique_ptr<net::ProxyConfigService>
 ShellURLRequestContextGetter::GetProxyConfigService() {
-  return net::ProxyService::CreateSystemProxyConfigService(io_task_runner_,
-                                                           file_task_runner_);
+  return net::ProxyService::CreateSystemProxyConfigService(io_task_runner_);
 }
 
 std::unique_ptr<net::ProxyService>
 ShellURLRequestContextGetter::GetProxyService() {
   // TODO(jam): use v8 if possible, look at chrome code.
   return net::ProxyService::CreateUsingSystemProxyResolver(
       std::move(proxy_config_service_), url_request_context_->net_log());
 }
 
 net::URLRequestContext* ShellURLRequestContextGetter::GetURLRequestContext() {
@@ skipping 143 matching lines @@
 scoped_refptr<base::SingleThreadTaskRunner>
     ShellURLRequestContextGetter::GetNetworkTaskRunner() const {
   return BrowserThread::GetTaskRunnerForThread(BrowserThread::IO);
 }
 
 net::HostResolver* ShellURLRequestContextGetter::host_resolver() {
   return url_request_context_->host_resolver();
 }
 
 }  // namespace content