Make the fuchsia mojo/public repo the source of truth.

mojo/public/tools/dart_snapshotter.py

-#!/usr/bin/env python
-# Copyright 2015 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.
-
-import argparse
-import subprocess
-import sys
-import os
-
-def main():
-  parser = argparse.ArgumentParser(description='Snapshots Mojo applications')
-  parser.add_argument('executable', type=str)
-  parser.add_argument('main', type=str)
-  parser.add_argument('--package-root', type=str)
-  parser.add_argument('--snapshot', type=str)
-  parser.add_argument('--depfile', type=str)
-  parser.add_argument('--build-output', type=str)
-
-  args = parser.parse_args()
-  if not os.path.isfile(args.executable):
-    print "file not found: " + args.executable
-  return subprocess.check_call([
-    args.executable,
-    args.main,
-    '--package-root=%s' % args.package_root,
-    '--snapshot=%s' % args.snapshot,
-    '--depfile=%s' % args.depfile,
-    '--build-output=%s' % args.build_output,
-  ])
-
-if __name__ == '__main__':
-  sys.exit(main())