Stop refcounting URLRequestContext.

chrome/browser/io_thread.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_BROWSER_IO_THREAD_H_
 #define CHROME_BROWSER_IO_THREAD_H_
 #pragma once
 
 #include <string>
 
@@ skipping 77 matching lines @@
     scoped_ptr<net::FtpTransactionFactory>
         proxy_script_fetcher_ftp_transaction_factory;
     scoped_ptr<net::URLRequestThrottlerManager> throttler_manager;
     scoped_ptr<net::URLSecurityManager> url_security_manager;
     // We use a separate URLRequestContext for PAC fetches, in order to break
     // the reference cycle:
     // URLRequestContext=>PAC fetch=>URLRequest=>URLRequestContext.
     // The first URLRequestContext is |system_url_request_context|. We introduce
     // |proxy_script_fetcher_context| for the second context. It has a direct
     // ProxyService, since we always directly connect to fetch the PAC script.
-    scoped_refptr<net::URLRequestContext> proxy_script_fetcher_context;
+    scoped_ptr<net::URLRequestContext> proxy_script_fetcher_context;
     scoped_ptr<net::ProxyService> system_proxy_service;
     scoped_ptr<net::HttpTransactionFactory> system_http_transaction_factory;
     scoped_ptr<net::FtpTransactionFactory> system_ftp_transaction_factory;
-    scoped_refptr<net::URLRequestContext> system_request_context;
+    scoped_ptr<net::URLRequestContext> system_request_context;
     SystemRequestContextLeakChecker system_request_context_leak_checker;
     // |system_cookie_store| and |system_server_bound_cert_service| are shared
     // between |proxy_script_fetcher_context| and |system_request_context|.
     scoped_refptr<net::CookieStore> system_cookie_store;
     scoped_ptr<net::ServerBoundCertService> system_server_bound_cert_service;
     scoped_refptr<ExtensionEventRouterForwarder>
         extension_event_router_forwarder;
     scoped_ptr<chrome_browser_net::HttpPipeliningCompatibilityClient>
         http_pipelining_compatibility_client;
   };
@@ skipping 98 matching lines @@
       system_url_request_context_getter_;
 
   net::SdchManager* sdch_manager_;
 
   base::WeakPtrFactory<IOThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IOThread);
 };
 
 #endif  // CHROME_BROWSER_IO_THREAD_H_