Move code starting the editor into a common function.

drover.py

 #!/usr/bin/env 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.
 
 import optparse
 import os
 import re
 import sys
 
@@ skipping 459 matching lines @@
   filename = str(revision)+".txt"
   out = open(filename,"w")
   out.write(action +" " + str(revision) + " - ")
   out.write(getRevisionLog(url, revision))
   if (author):
     out.write("\nTBR=" + author)
   out.close()
 
   change_cmd = 'change ' + str(revision) + " " + filename
   if options.revertbot:
-    change_cmd += ' --silent'
+    if sys.platform == 'win32':
+      os.environ['SVN_EDITOR'] = 'cmd.exe /c exit'
+    else:
+      os.environ['SVN_EDITOR'] = 'true'
   runGcl(change_cmd)
   os.unlink(filename)
 
   if options.local:
     return 0
 
   print author
   print revision
   print ("gcl upload " + str(revision) +
          " --send_mail --no_presubmit --reviewers=" + author)
@@ skipping 55 matching lines @@
 
   if options.local and (options.revert or options.branch):
     option_parser.error("--local cannot be used with --revert or --branch")
     return 1
 
   return drover(options, args)
 
 
 if __name__ == "__main__":
   sys.exit(main())