Change logging statements to not use the "%" operator.

third_party/WebKit/Tools/Scripts/webkitpy/common/net/networktransaction.py

 # Copyright (C) 2010 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 41 matching lines @@
     def run(self, request):
         self._total_sleep = 0
         self._backoff_seconds = self._initial_backoff_seconds
         while True:
             try:
                 return request()
             except urllib2.HTTPError as e:
                 if self._convert_404_to_None and e.code == 404:
                     return None
                 self._check_for_timeout()
-                _log.warn("Received HTTP status %s loading \"%s\".  Retrying in %s seconds..." %
-                          (e.code, e.filename, self._backoff_seconds))
+                _log.warning("Received HTTP status %s loading \"%s\".  Retrying in %s seconds...",
+                             e.code, e.filename, self._backoff_seconds)
                 self._sleep()
 
     def _check_for_timeout(self):
         if self._total_sleep + self._backoff_seconds > self._timeout_seconds:
             raise NetworkTimeout()
 
     def _sleep(self):
         time.sleep(self._backoff_seconds)
         self._total_sleep += self._backoff_seconds
         self._backoff_seconds *= self._grown_factor