Revert 148418 - Always use chromium threads for IO in remoting host

remoting/host/url_request_context.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.
 
 #include "remoting/host/url_request_context.h"
 
 #include "base/message_loop_proxy.h"
 #include "net/base/cert_verifier.h"
 #include "net/base/host_resolver.h"
 #include "net/base/ssl_config_service_defaults.h"
-#include "net/base/transport_security_state.h"
 #include "net/http/http_auth_handler_factory.h"
 #include "net/http/http_network_layer.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_server_properties_impl.h"
 #include "net/proxy/proxy_config_service.h"
 #include "net/proxy/proxy_service.h"
 #include "remoting/host/vlog_net_log.h"
 
 #if defined(OS_WIN)
 #include "net/proxy/proxy_config_service_win.h"
@@ skipping 65 matching lines @@
       net::CreateSystemHostResolver(net::HostResolver::kDefaultParallelism,
                                     net::HostResolver::kDefaultRetryAttempts,
                                     net_log.get()));
   storage_.set_proxy_service(net::ProxyService::CreateUsingSystemProxyResolver(
       proxy_config_service.release(), 0u, net_log.get()));
   storage_.set_cert_verifier(net::CertVerifier::CreateDefault());
   storage_.set_ssl_config_service(new net::SSLConfigServiceDefaults);
   storage_.set_http_auth_handler_factory(
       net::HttpAuthHandlerFactory::CreateDefault(host_resolver()));
   storage_.set_http_server_properties(new net::HttpServerPropertiesImpl);
-  storage_.set_transport_security_state(new net::TransportSecurityState);
 
   net::HttpNetworkSession::Params session_params;
   session_params.host_resolver = host_resolver();
   session_params.cert_verifier = cert_verifier();
   session_params.proxy_service = proxy_service();
   session_params.ssl_config_service = ssl_config_service();
   session_params.http_auth_handler_factory = http_auth_handler_factory();
   session_params.http_server_properties = http_server_properties();
   session_params.net_log = net_log.get();
   scoped_refptr<net::HttpNetworkSession> network_session(
@@ skipping 25 matching lines @@
 
 scoped_refptr<base::SingleThreadTaskRunner>
 URLRequestContextGetter::GetNetworkTaskRunner() const {
   return network_task_runner_;
 }
 
 URLRequestContextGetter::~URLRequestContextGetter() {
 }
 
 }  // namespace remoting