Use TaskRunner passed in to URLRequestContextBuilder only for the cache

remoting/base/url_request_context_getter.cc

 // Copyright 2014 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 "remoting/base/url_request_context_getter.h"
 
 #include <utility>
 
 #include "base/single_thread_task_runner.h"
 #include "net/proxy/proxy_config_service.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_builder.h"
 #include "remoting/base/vlog_net_log.h"
 
 namespace remoting {
 
 URLRequestContextGetter::URLRequestContextGetter(
     scoped_refptr<base::SingleThreadTaskRunner> network_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> file_task_runner)
     : network_task_runner_(network_task_runner),
       file_task_runner_(file_task_runner),
       proxy_config_service_(net::ProxyService::CreateSystemProxyConfigService(
           network_task_runner)) {}
 
 net::URLRequestContext* URLRequestContextGetter::GetURLRequestContext() {
   if (!url_request_context_.get()) {
     net::URLRequestContextBuilder builder;
-    builder.SetFileTaskRunner(file_task_runner_);
     net_log_.reset(new VlogNetLog());
     builder.set_net_log(net_log_.get());
     builder.DisableHttpCache();
     builder.set_proxy_config_service(std::move(proxy_config_service_));
     url_request_context_ = builder.Build();
   }
   return url_request_context_.get();
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 URLRequestContextGetter::GetNetworkTaskRunner() const {
   return network_task_runner_;
 }
 
 URLRequestContextGetter::~URLRequestContextGetter() {
 }
 
 }  // namespace remoting