Revert "[infra] Roll clang to match the version used by Flutter"

tools/buildtools/update.py

Index: tools/buildtools/update.py
diff --git a/tools/buildtools/update.py b/tools/buildtools/update.py
deleted file mode 100755
index 6d676293aa43f3d1b1112c82f05cc6caa84c9e41..0000000000000000000000000000000000000000
--- a/tools/buildtools/update.py
+++ /dev/null
@@ -1,88 +0,0 @@
-#!/usr/bin/env python
-# Copyright 2017 The Dart project authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-"""Pulls down tools required to build Dart."""
-
-import os
-import subprocess
-import shutil
-import sys
-
-THIS_DIR = os.path.abspath(os.path.dirname(__file__))
-DART_ROOT = os.path.abspath(os.path.join(THIS_DIR, '..', '..'))
-BUILDTOOLS = os.path.join(DART_ROOT, 'buildtools')
-TOOLS_BUILDTOOLS = os.path.join(DART_ROOT, 'tools', 'buildtools')
-
-sys.path.insert(0, os.path.join(DART_ROOT, 'tools'))
-import find_depot_tools
-
-DEPOT_PATH = find_depot_tools.add_depot_tools_to_path()
-
-
-def Update():
-  path = os.path.join(BUILDTOOLS, 'update.sh')
-  return subprocess.call(['/bin/bash', path, '--toolchain', '--gn'], cwd=DART_ROOT)
-
-
-def UpdateGNOnWindows():
-  sha1_file = os.path.join(BUILDTOOLS, 'win', 'gn.exe.sha1')
-  downloader_script = os.path.join(DEPOT_PATH, 'download_from_google_storage.py')
-  download_cmd = [
-    'python',
-    downloader_script,
-    '--no_auth',
-    '--no_resume',
-    '--quiet',
-    '--platform=win*',
-    '--bucket',
-    'chromium-gn',
-    '-s',
-    sha1_file
-  ]
-  return subprocess.call(download_cmd)
-
-
-def UpdateClangFormatOnWindows():
-  sha1_file = os.path.join(TOOLS_BUILDTOOLS, 'win', 'clang-format.exe.sha1')
-  output_dir = os.path.join(BUILDTOOLS, 'win', 'clang-format.exe')
-  downloader_script = os.path.join(DEPOT_PATH, 'download_from_google_storage.py')
-  download_cmd = [
-    'python',
-    downloader_script,
-    '--no_auth',
-    '--no_resume',
-    '--quiet',
-    '--platform=win',
-    '--bucket',
-    'chromium-clang-format',
-    '-s',
-    sha1_file,
-    '-o',
-    output_dir
-  ]
-  return subprocess.call(download_cmd)
-
-
-def CopyClangFormatScripts():
-  linux_script = os.path.join(TOOLS_BUILDTOOLS, 'linux64', 'clang-format')
-  mac_script = os.path.join(TOOLS_BUILDTOOLS, 'mac', 'clang-format')
-  linux_dest = os.path.join(BUILDTOOLS, 'linux64', 'clang-format')
-  mac_dest = os.path.join(BUILDTOOLS, 'mac', 'clang-format')
-  shutil.copy2(linux_script, linux_dest)
-  shutil.copy2(mac_script, mac_dest)
-
-
-def main(argv):
-  if sys.platform.startswith('win'):
-    result = UpdateGNOnWindows()
-    if result != 0:
-      return result
-    return UpdateClangFormatOnWindows()
-  CopyClangFormatScripts()
-  return Update()
-
-
-if __name__ == '__main__':
-  sys.exit(main(sys.argv))