Add targets for generating version files in Windows GN build.

chrome/tools/build/make_version_cc.py

-#!/usr/bin/env python
-
-# Copyright (c) 2009 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.
-
-# Creates chrome_version.cc which contains the definition of the
-# kChromeVersion constant.
-
-import sys
-
-def main(me, args):
-  if len(args) != 2:
-    print >>sys.stderr, 'usage: %s version.cc version' % me
-    return 1
-
-  (cc_file, version) = args
-
-  contents = '''// automatically generated by %s
-
-#include "chrome/common/chrome_constants.h"
-
-namespace chrome {
-
-const char kChromeVersion[] = "%s";
-
-}  // namespace chrome
-''' % (me, version)
-
-  output = open(cc_file, 'w')
-  output.write(contents)
-  output.close()
-
-  return 0
-
-if __name__ == '__main__':
-  sys.exit(main(sys.argv[0], sys.argv[1:]))