[GN] Convert generate_localizable_strings.gni to use compiled_action.gni.

ios/chrome/tools/strings/generate_localizable_strings.py

-# Copyright 2016 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 os
-import sys
-
-
-def Main(args):
-  if len(args) < 5:
-    sys.stderr.write(
-        'usage: %s tool config include_dir datapack_dir output_dir locales ...'
-        % os.path.basename(sys.argv[0]))
-    sys.exit(1)
-
-  tool, config_file, include_dir, datapack_dir, output_dir = args[:5]
-  locales = args[5:]
-
-  os.execv(tool, [tool, '-c', config_file, '-I', include_dir, '-p',
-      datapack_dir, '-o', output_dir] + locales)
-  sys.exit(1)
-
-
-if __name__ == '__main__':
-  Main(sys.argv[1:])