Make getBranchForMilestone() explictly request the CSV data.

drover.py

 #!/usr/bin/env python
 # 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.
 
 import optparse
 import os
 import re
 import string
 import sys
@@ skipping 350 matching lines @@
 
   Anything that's A will require special treatment (either a merge or an
   export + add)
   """
   return ['%s/%s' % (f[2], f[3]) for f in files_info]
 
 
 def getBranchForMilestone(milestone):
   """Queries omahaproxy.appspot.com for the branch number given |milestone|.
   """
-  OMAHA_PROXY_URL = "http://omahaproxy.appspot.com"
+  OMAHA_PROXY_URL = "http://omahaproxy.appspot.com/all?csv=1"
   request = urllib2.Request(OMAHA_PROXY_URL)
   try:
     response = urllib2.urlopen(request)
   except urllib2.HTTPError, e:
     print "Failed to query %s: %d" % (OMAHA_PROXY_URL, e.code)
     return None
 
   # Dictionary of [branch: major]. When searching for the appropriate branch
   # matching |milestone|, all major versions that match are added to the
   # dictionary. If all of the branches are the same, this branch value is
@@ skipping 291 matching lines @@
 
   if options.branch and options.milestone:
     option_parser.error("--branch cannot be used with --milestone")
     return 1
 
   return drover(options, args)
 
 
 if __name__ == "__main__":
   sys.exit(main())