Use automatic memory management for URLRequestContext's members....

net/http/http_transaction_winhttp.h

 // Copyright (c) 2006-2008 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 NET_HTTP_HTTP_TRANSACTION_WINHTTP_H__
 #define NET_HTTP_HTTP_TRANSACTION_WINHTTP_H__
 
 #include <windows.h>
 #include <winhttp.h>
 
@@ skipping 22 matching lines @@
       DCHECK(proxy_service);
     }
     ~Factory();
 
     virtual HttpTransaction* CreateTransaction();
     virtual HttpCache* GetCache();
     virtual void Suspend(bool suspend);
 
    private:
     Session* session_;
-    ProxyService* proxy_service_;
+    scoped_refptr<ProxyService> proxy_service_;
     bool is_suspended_;
     DISALLOW_EVIL_CONSTRUCTORS(Factory);
   };
 
   virtual ~HttpTransactionWinHttp();
 
   // HttpTransaction methods:
   virtual int Start(const HttpRequestInfo*, CompletionCallback*);
   virtual int RestartIgnoringLastError(CompletionCallback*);
   virtual int RestartWithAuth(const std::wstring&,
@@ skipping 136 matching lines @@
   // True if we have used the username/password embedded in the URL.
   bool used_embedded_credentials_;
 
   DISALLOW_EVIL_CONSTRUCTORS(HttpTransactionWinHttp);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_TRANSACTION_WINHTTP_H__