Revert of Remove unused imports in webkitpy.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/servers/pywebsocket.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 16 matching lines @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 """A class to help start/stop the PyWebSocket server as used by the layout tests."""
 
 import logging
 import os
 import sys
 import time
 
 from webkitpy.layout_tests.servers import server_base
+from webkitpy.thirdparty import mod_pywebsocket
 
 _log = logging.getLogger(__name__)
 
 
 _WS_LOG_PREFIX = 'pywebsocket.ws.log-'
 
 _DEFAULT_WS_PORT = 8880
 
 
 class PyWebSocket(server_base.ServerBase):
@@ skipping 20 matching lines @@
             '--port', str(self._port),
             '--document-root', self._web_socket_tests,
             '--scan-dir', self._web_socket_tests,
             '--cgi-paths', '/',
             '--log-file', self._error_log,
             '--websock-handlers-map-file', self._filesystem.join(self._web_socket_tests, 'handler_map.txt'),
         ]
         # TODO(burnik): Check if this is really needed (and why). If not, just set PYTHONPATH.
         self._env = self._port_obj.setup_environ_for_server()
         self._env['PYTHONPATH'] = (pywebsocket_base + os.pathsep + self._env.get('PYTHONPATH', ''))