infra: remove an unnecessary script

This script is stale now.

Bug: 954450
Change-Id: I13a9d70b00939bbc50fc987f46407a85867e1746
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2035818
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Yoshisato Yanagisawa <yyanagisawa@google.com>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738826}

infra/scripts/update_dimensions.py

-#!/usr/bin/env python
-# Copyright 2019 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.
-
-# TODO(yyanagisawa): remove this script after the migration. (crbug.com/954450)
-"""
-Script to change bots dimensions from trusty to xenial (crbug.com/954450).
-It also marks the builders to use builderless bots.
-
-How to use:
-  $ ./update_dimensions.py <cr-buildbucket.cfg> <builder name>
-  $ git cl issue 0
-  $ git cl upload
-
-  e.g.
-  $ ./update_dimensions.py cr-buildbucket.cfg android-marshmallow-arm64-rel
-"""
-
-import cStringIO as StringIO
-import os
-import re
-import subprocess
-import sys
-
-
-BUILDERS_PATTERN = re.compile(r'\s*builders\s*{\s*')
-
-
-def InsertMixin(builder_info, mixin_name):
-  """Insert given mixin_name to info.
-
-  Args:
-    builder_info: contents of builder section.
-    mixin_name: mixin name to be inserted.
-  """
-  for line in builder_info.splitlines():
-    if 'mixin' in line:
-      idx = line.find('mixin')
-  builder_info += '%smixins: "%s"\n' % (' ' * idx, mixin_name)
-  return builder_info
-
-
-def UpdateConfig(config_filename, target_builder):
-  """Update cr-buildbucket.cfg to use xenial instead of trusty.
-
-  Args:
-    config_filename: cr-buildbucket.cfg filename.
-    target_builder: target builder name to update.
-  """
-  in_builders = False
-  depth = 0
-  builder_name_line = 'name: "%s"' % target_builder
-  builder_info = ''
-  should_replace = False
-
-  out = StringIO.StringIO()
-
-  with open(config_filename) as f:
-    for line in f:
-      if BUILDERS_PATTERN.match(line) and not '}' in line:
-        in_builders = True
-        depth = 1
-      elif in_builders and '{' in line:
-        depth += 1
-      elif in_builders and '}' in line:
-        depth -= 1
-      if depth == 0:
-        in_builders = False
-        if should_replace:
-          builder_info = InsertMixin(builder_info, 'builderless')
-          out.write(builder_info.replace('Ubuntu-14.04', 'Ubuntu-16.04'))
-        else:
-          out.write(builder_info)
-        builder_info = ''
-        should_replace = False
-      if in_builders:
-        builder_info += line
-      else:
-        out.write(line)
-
-      if in_builders and builder_name_line in line:
-        should_replace = True
-  with open(config_filename, 'w') as f:
-    f.write(out.getvalue())
-
-
-def main(argv):
-  if len(argv) != 3:
-    raise Exception('unexpected args')
-
-  UpdateConfig(argv[1], argv[2])
-  message = """switch trusty to xenial for %s CQ/CI builder
-
-Bug: 954450""" % argv[2]
-  subprocess.check_call(['git', 'add', os.path.basename(argv[1])],
-                        cwd=os.path.dirname(os.path.abspath(argv[1])))
-  subprocess.check_call(
-      ['git', 'commit', '-m', message],
-      cwd=os.path.dirname(os.path.abspath(argv[1])))
-
-if __name__ == '__main__':
-  main(sys.argv)