Remove old annotated_steps buildbot scripts and dispatcher

tools/bots/set_reference_build_revision.py

-#!/usr/bin/env python
-#
-# Copyright (c) 2014 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.
-
-"""Writes a revision number into src/chrome/tools/test/reference_build/REVISON
-   Must be run from the root of a Dartium or multivm checkout.
-
-Usage:
-  $ ./src/dart/tools/bots/set_reference_build_revision.py <revision>
-"""
-
-import os
-import sys
-
-def main(argv):
-  revision = argv[1]
-  output = os.path.join('src', 'chrome', 'tools',
-                        'test', 'reference_build',
-                        'REQUESTED_REVISION')
-  dirname = os.path.dirname(output)
-  if dirname and not os.path.exists(dirname):
-    os.makedirs(dirname)
-  with file(output, 'w') as f:
-    f.write(revision)
-
-if __name__ == '__main__':
-  sys.exit(main(sys.argv))