Do not use named arguments to call positional arguments.

gclient.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.
 
 """Meta checkout manager supporting both Subversion and GIT.
 
 Files
   .gclient      : Current client configuration, written by 'config' command.
                   Format is a Python script defining 'solutions', a list whose
@@ skipping 1079 matching lines @@
     assert len(dep.safesync_url) > 0
     handle = urllib.urlopen(dep.safesync_url)
     rev = handle.read().strip()
     handle.close()
     if not rev:
       raise gclient_utils.Error(
           'It appears your safesync_url (%s) is not working properly\n'
           '(as it returned an empty response). Check your config.' %
           dep.safesync_url)
     scm = gclient_scm.CreateSCM(dep.url, dep.root.root_dir, dep.name)
-    safe_rev = scm.GetUsableRev(rev=rev, options=self._options)
+    safe_rev = scm.GetUsableRev(rev, self._options)
     if self._options.verbose:
       print('Using safesync_url revision: %s.\n' % safe_rev)
     self._options.revisions.append('%s@%s' % (dep.name, safe_rev))
 
   def RunOnDeps(self, command, args, ignore_requirements=False, progress=True):
     """Runs a command on each dependency in a client and its dependencies.
 
     Args:
       command: The command to use (e.g., 'status' or 'diff')
       args: list of str - extra arguments to add to the command line.
@@ skipping 706 matching lines @@
   except (gclient_utils.Error, subprocess2.CalledProcessError), e:
     print >> sys.stderr, 'Error: %s' % str(e)
     return 1
 
 
 if '__main__' == __name__:
   fix_encoding.fix_encoding()
   sys.exit(Main(sys.argv[1:]))
 
 # vim: ts=2:sw=2:tw=80:et: