Use `git rev-list A..B` to get the list of commits to be uploaded to Gerrit by git cl.

tests/git_cl_test.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.
 
 """Unit tests for git_cl.py."""
 
 import os
 import StringIO
 import stat
@@ skipping 571 matching lines @@
           ((['git', 'log', '--pretty=format:%s\n\n%b',
              'fake_ancestor_sha..HEAD'],),
            description),
           ((['git', 'commit', '--amend', '-m', description],),
            ''),
           ((['git', 'log', '--pretty=format:%s\n\n%b',
              'fake_ancestor_sha..HEAD'],),
            description)
           ]
     calls += [
-        ((['git', 'rev-list', 'origin/master...'],), ''),
+        ((['git', 'rev-list', 'origin/master..'],), ''),
         ((['git', 'config', 'rietveld.cc'],), '')
         ]
     receive_pack = '--receive-pack=git receive-pack '
     receive_pack += '--cc=joe@example.com'  # from watch list
     if reviewers:
       receive_pack += ' '
       receive_pack += ' '.join(
           '--reviewer=' + email for email in sorted(reviewers))
     receive_pack += ''
     calls += [
@@ skipping 143 matching lines @@
       obj = git_cl.ChangeDescription(orig)
       obj.update_reviewers(reviewers)
       actual.append(obj.description)
     self.assertEqual(expected, actual)
 
 
 if __name__ == '__main__':
   git_cl.logging.basicConfig(
       level=git_cl.logging.DEBUG if '-v' in sys.argv else git_cl.logging.ERROR)
   unittest.main()