Remove some old leftover cleanup code

utils/compiler/remove_old_scripts.py

-#!/usr/bin/env python
-# Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-# for details. All rights reserved. Use of this source code is governed by a
-# BSD-style license that can be found in the LICENSE file.
-
-'''
-Tool for deleting files given on the command line, and touching a
-file on success.
-
-Usage:
-  python tools/list_files.py FILE_TO_TOUCH FILES_TO_DELETE...
-'''
-
-import os
-import sys
-
-
-def main(argv):
-  file_to_touch = argv[1]
-  for filename in argv[2:]:
-    if os.path.exists(filename):
-      os.remove(filename)
-  with file(file_to_touch, 'a'):
-    os.utime(file_to_touch, None)
-
-
-if __name__ == '__main__':
-  sys.exit(main(sys.argv))