Small renaming of temporary msi installer in signing script

dart/tools/signing_script.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 import imp
 import optparse
 import os
 import subprocess
@@ skipping 206 matching lines @@
       'content_shell_scratch' : 'ContentShell%(bits)s.app',
 
       'zip' : True,
     },
     'win32' : {
       'editor' : os.path.join('dart', 'DartEditor.exe'),
       'chrome' : os.path.join('dart', 'chromium', 'chrome.exe'),
       'content_shell' : os.path.join('dart', 'chromium',
                                      'content_shell.exe'),
 
-      'msi_scratch' : 'darteditor-installer-windows-%(bits)s.exe',
+      'msi_scratch' : 'darteditor-installer-windows-%(bits)s.msi',
       'editor_scratch' : 'DartEditor%(bits)s.exe',
       'chrome_scratch' : 'chromium%(bits)s.exe',
       'content_shell_scratch' : 'content_shell%(bits)s.exe',
 
       'zip' : False,
     },
   }
 
   # Desitination of zip files we download
   for system in ('macos', 'win32'):
@@ skipping 65 matching lines @@
         # Upload *.msi installer and set 'public-read ACL
         if system == 'win32':
           postsign_msi = os.path.join(
               postsign_dir, locations[system]['msi_scratch'] % config)
           upload_msi_installer_to_new_location(
               options.channel, config, postsign_msi)
 
 if __name__ == '__main__':
   main()