Allow ProxyService to share URLRequestContext with everything else.

chromeos/network/dhcp_proxy_script_fetcher_chromeos.h

 // Copyright (c) 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.
 
 #ifndef CHROMEOS_NETWORK_DHCP_PROXY_SCRIPT_FETCHER_CHROMEOS_H_
 #define CHROMEOS_NETWORK_DHCP_PROXY_SCRIPT_FETCHER_CHROMEOS_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 21 matching lines @@
     : public net::DhcpProxyScriptFetcher {
  public:
   explicit DhcpProxyScriptFetcherChromeos(
       net::URLRequestContext* url_request_context);
   ~DhcpProxyScriptFetcherChromeos() override;
 
   // net::DhcpProxyScriptFetcher
   int Fetch(base::string16* utf16_text,
             const net::CompletionCallback& callback) override;
   void Cancel() override;
+  void OnShutdown() override;
   const GURL& GetPacURL() const override;
   std::string GetFetcherName() const override;
 
  private:
   void ContinueFetch(base::string16* utf16_text,
                      net::CompletionCallback callback,
                      std::string pac_url);
 
-  net::URLRequestContext* url_request_context_;  // Weak ptr
   std::unique_ptr<net::ProxyScriptFetcher> proxy_script_fetcher_;
   scoped_refptr<base::SingleThreadTaskRunner> network_handler_task_runner_;
 
   GURL pac_url_;
 
   base::WeakPtrFactory<DhcpProxyScriptFetcherChromeos> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DhcpProxyScriptFetcherChromeos);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_NETWORK_DHCP_PROXY_SCRIPT_FETCHER_CHROMEOS_H_