Remove unnecessary pass statements.

third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/scm/scm_mock.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 79 matching lines @@
             return 5678
         if git_commit == '624caaaaaa':
             return 10000
         return None
 
     def timestamp_of_revision(self, path, revision):
         return '2013-02-01 08:48:05 +0000'
 
     def commit_locally_with_message(self, message):
         self._local_commits.append([message])
-        pass
 
     def local_commits(self):
         """For testing purposes, returns the internal recording of commits made via commit_locally_with_message.
         Format as [ message, commit_all_working_directory_changes, author ]."""
         return self._local_commits
 
     def delete(self, path):
         return self.delete_list([path])
 
     def delete_list(self, paths):
         if not self._filesystem:
             return
         for path in paths:
             if self._filesystem.exists(path):
                 self._filesystem.remove(path)
 
     def move(self, origin, destination):
         if self._filesystem:
             self._filesystem.move(self.absolute_path(origin), self.absolute_path(destination))
 
     def changed_files(self):
         return []