[Chromoting] Remove check for too many args from signing script.

remoting/host/installer/mac/do_signing.sh

 #!/bin/sh
 
 # Copyright (c) 2012 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.
 
 # This script signs the Chromoting binaries, builds the Chrome Remote Desktop
 # installer and then packages it into a .dmg.  It requires that Iceberg be
 # installed (for 'freeze').
 #
@@ skipping 186 matching lines @@
   build_packages "${input_dir}"
   if [[ -n "${productsign_id}" ]]; then
     echo "Signing installer..."
     sign_installer "${input_dir}" "${keychain}" "${productsign_id}"
   fi
   build_dmg "${input_dir}" "${output_dir}"
 
   cleanup
 }
 
-if [[ ${#} < 4 || ${#} > 5 ]]; then
+if [[ ${#} < 4 ]]; then
   usage
   exit 1
 fi
 
 main "${@}"
 exit ${?}