fix minor typo in buildbot script.

visual_studio/NativeClientVSAddIn/buildbot_run.py

 # 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
 
 """Entry point for the AddIn build bot.
 
 Perform build steps and output results using the buildbot
 annootator syntax
 """
 
@@ skipping 45 matching lines @@
 
 def _GetGsutil():
   if os.environ.get('BUILDBOT_BUILDERNAME'):
     # When running in a buildbot slave use
     # gsutil from the slave scripts folder
     import slave
     slave_dir = os.path.dirname(slave.__file__)
     gsutil = os.path.join(slave_dir, 'gsutil')
     if os.name == 'nt':
       gsutil += '.bat'
+    gsutil = [gsutil]
   else:
     if os.name == 'nt':
       gsutil = [sys.executable, _FindInPath('gsutil')]
     else:
       gsutil = ['gsutil']
 
   return gsutil
 
 
 def StepArchive():
@@ skipping 16 matching lines @@
 
 
 def main():
   StepBuild()
   StepTest()
   StepArchive()
 
 
 if __name__ == '__main__':
   main()