Remove unnecessary pass statements.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/servers/server_base.py

 # Copyright (C) 2011 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 129 matching lines @@
             self._stop_running_server()
             _log.debug("%s server at pid %d stopped" % (self._name, self._pid))
             self._pid = None
         finally:
             # Make sure we delete the pid file no matter what happens.
             self._remove_pid_file()
 
     def _prepare_config(self):
         """This routine can be overridden by subclasses to do any sort
         of initialization required prior to starting the server that may fail."""
-        pass
 
     def _remove_stale_logs(self):
         """This routine can be overridden by subclasses to try and remove logs
         left over from a prior run. This routine should log warnings if the
         files cannot be deleted, but should not fail unless failure to
         delete the logs will actually cause start() to fail."""
         # Sometimes logs are open in other processes but they should clear eventually.
         for log_prefix in self._log_prefixes:
             try:
                 self._remove_log_files(self._output_dir, log_prefix)
@@ skipping 113 matching lines @@
             except IOError as e:
                 if e.errno in (errno.EALREADY, errno.EADDRINUSE):
                     raise ServerError('Port %d is already in use.' % port)
                 elif self._platform.is_win() and e.errno in (errno.WSAEACCES,):  # pylint: disable=E1101
                     raise ServerError('Port %d is already in use.' % port)
                 else:
                     raise
             finally:
                 s.close()
         _log.debug('all ports are available')