Move ProxyConfigService construction onto the IO thread.

chrome/service/net/service_url_request_context.h

 // 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.
 
 #ifndef CHROME_SERVICE_NET_SERVICE_URL_REQUEST_CONTEXT_H_
 #define CHROME_SERVICE_NET_SERVICE_URL_REQUEST_CONTEXT_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 49 matching lines @@
   }
   std::string user_agent() const {
     return user_agent_;
   }
 
  private:
   friend class ServiceProcess;
   ServiceURLRequestContextGetter();
   virtual ~ServiceURLRequestContextGetter();
 
+  void StartTearDown();
+
   std::string user_agent_;
+  scoped_refptr<base::SingleThreadTaskRunner> glib_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
-  scoped_ptr<net::ProxyConfigService> proxy_config_service_;
   scoped_ptr<net::URLRequestContext> url_request_context_;
 };
 
 #endif  // CHROME_SERVICE_NET_SERVICE_URL_REQUEST_CONTEXT_H_