Doc server broken link detection

chrome/common/extensions/docs/server2/handler.py

 # Copyright (c) 2012 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.
 
 from cron_servlet import CronServlet
+from instance_servlet import InstanceServlet
 from patch_servlet import PatchServlet
-from instance_servlet import InstanceServlet
 from servlet import Servlet, Request, Response
 
 _DEFAULT_SERVLET = InstanceServlet.GetConstructor()
 _SERVLETS = {
   'cron': CronServlet,
   'patch': PatchServlet,
 }
 
 class Handler(Servlet):
   def Get(self):
     path = self._request.path
 
     if path.startswith('_'):
       servlet_path = path[1:]
       if not '/' in servlet_path:
         servlet_path += '/'
       servlet_name, servlet_path = servlet_path.split('/', 1)
       servlet = _SERVLETS.get(servlet_name)
       if servlet is None:
         return Response.NotFound('"%s" servlet not found' %  servlet_path)
     else:
       servlet_path = path
       servlet = _DEFAULT_SERVLET
 
     return servlet(
       Request(servlet_path, self._request.host, self._request.headers)).Get()