Remove unnecessary pass statements.

third_party/WebKit/Tools/Scripts/webkitpy/common/message_pool.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 166 matching lines @@
                     continue
                 method = getattr(self, '_handle_' + message.name)
                 assert method, 'bad message %s' % repr(message)
                 method(message.src, *message.args)
         except Queue.Empty:
             pass
 
 
 class WorkerException(BaseException):
     """Raised when we receive an unexpected/unknown exception from a worker."""
-    pass
 
 
 class _Message(object):
 
     def __init__(self, src, message_name, message_args, from_user, logs):
         self.src = src
         self.name = message_name
         self.args = message_args
         self.from_user = from_user
         self.logs = logs
@@ skipping 125 matching lines @@
 
 class _WorkerLogHandler(logging.Handler):
 
     def __init__(self, worker):
         logging.Handler.__init__(self)
         self._worker = worker
         self.setLevel(worker.log_level)
 
     def emit(self, record):
         self._worker.log_messages.append(record)