bced896d37
This reverts the change[1] made earlier to workaround the issue caused
by usage of vendored version of six library in the django-pyscss
library.
The django-pyscss library no longer imports the vendored version of
six, since 2.0.3[2].
[1] 39f28ad5edacc31575d1de4971de56d765567b58
[2] 1499332e1d
Change-Id: I22802b75d6a8d8f35930709e89d64dd65982cef0