[logdog] Remove reference to six

Change-Id: I01f07d32a4b79aff3cf89823246e4a203245b799
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/7114780
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>
Auto-Submit: Rob Mohr <mohrr@google.com>
Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
NOKEYCHECK=True
GitOrigin-RevId: 62666a346341479c70fed19331c22ce271936b36
diff --git a/streamname.py b/streamname.py
index 91037b2..3bb26fd 100644
--- a/streamname.py
+++ b/streamname.py
@@ -5,9 +5,7 @@
 import collections
 import re
 import string
-
-# third_party/
-from six.moves import urllib
+import urllib
 
 _STREAM_SEP = '/'
 _ALNUM_CHARS = string.ascii_letters + string.digits