Strip trailing / or \ when rolling.

roll_dep.py

 #!/usr/bin/env python
 # Copyright 2015 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.
 
 """Rolls DEPS controlled dependency.
 
 Works only with git checkout and git dependencies.  Currently this
 script will always roll to the tip of to origin/master.
 """
@@ skipping 184 matching lines @@
   reviewers = None
   if args.reviewer:
     reviewers = args.reviewer.split(',')
     for i, r in enumerate(reviewers):
       if not '@' in r:
         reviewers[i] = r + '@chromium.org'
 
   try:
     roll(
         os.getcwd(),
-        args.dep_path,
+        args.dep_path.rstrip('/').rstrip('\\'),
         args.roll_to,
         args.key,
         reviewers,
         args.bug,
         args.no_log,
         args.log_limit,
         args.ignore_dirty_tree)
 
   except Error as e:
     sys.stderr.write('error: %s\n' % e)
     return 1
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())