Adding 7-zip to third party so that we can zip SDKs on Windows.

dart/tools/upload_sdk.py

 #!/usr/bin/python
 
 # Copyright (c) 2011 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 zips the SDK and uploads it to Google Storage when run on a buildbot.
 #
 # Usage: upload_sdk.py path_to_sdk
 
@@ skipping 83 matching lines @@
       utils.GetBuildConf('release', 'ia32')):
     sdk_suffix = ''
   else:
     sdk_suffix = '-debug'
   # TODO(dgrove) - deal with architectures that are not ia32.
   sdk_file = 'dart-%s-%s%s.zip' % (utils.GuessOS(), revision, sdk_suffix)
   if (os.path.exists(SDK_LOCAL_ZIP)):
     os.remove(SDK_LOCAL_ZIP)
   if platform.system() == 'Windows':
     # Windows does not have zip. We use the 7 zip utility in third party.
-    ExecuteCommand([os.path.join('..', 'third_party', '7za920', '7za'), 'a',
+    ExecuteCommand([os.path.join('..', 'third_party', '7zip', '7za'), 'a',
         '-tzip', SDK_LOCAL_ZIP, os.path.basename(argv[1])])
   else:
     ExecuteCommand(['zip', '-yr', SDK_LOCAL_ZIP, os.path.basename(argv[1])])
   UploadArchive(SDK_LOCAL_ZIP,
                 GS_SITE + '/'.join([gsdir, GS_SDK_DIR, sdk_file]))
   latest_name = 'dart-%s-latest%s.zip' % (utils.GuessOS(), sdk_suffix)
   UploadArchive(SDK_LOCAL_ZIP,
                 GS_SITE + '/'.join([gsdir, GS_SDK_DIR, latest_name]))
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))