Make NSSCertDatabase::ListCerts work async on a worker thread.

net/ssl/client_cert_store_chromeos.h

 // Copyright 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 NET_SSL_CLIENT_CERT_STORE_CHROMEOS_H_
 #define NET_SSL_CLIENT_CERT_STORE_CHROMEOS_H_
 
 #include <string>
 
 #include "crypto/scoped_nss_types.h"
@@ skipping 38 matching lines @@
   // filter the system store when GetClientCerts() is called.
   // Implemented by creating a list of certificates that otherwise would be
   // extracted from the system store and filtering it using the common logic
   // (less adequate than the approach used on Windows).
   bool SelectClientCertsForTesting(const CertificateList& input_certs,
                                    const SSLCertRequestInfo& cert_request_info,
                                    CertificateList* selected_certs);
 
 
   std::string username_hash_;
-  NSSProfileFilterChromeOS profile_filter_;
+  scoped_refptr<NSSProfileFilterChromeOS> profile_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientCertStoreChromeOS);
 };
 
 }  // namespace net
 
 #endif  // NET_SSL_CLIENT_CERT_STORE_CHROMEOS_H_