Remove duplicate OAuthLibMixin from base classes (#1191)

Co-authored-by: Alan Crosswell <[email protected]>

Author: fdemmer

AUTHORS

@@ -52,6 +52,7 @@ Eduardo Oliveira
 Egor Poderiagin
 Emanuele Palazzetti
 Federico Dolce
+Florian Demmer
 Frederico Vieira
 Gaël Utard
 Hasan Ramezani

oauth2_provider/views/generic.py

@@ -2,14 +2,13 @@
 
 from .mixins import (
     ClientProtectedResourceMixin,
-    OAuthLibMixin,
     ProtectedResourceMixin,
     ReadWriteScopedResourceMixin,
     ScopedResourceMixin,
 )
 
 
-class ProtectedResourceView(ProtectedResourceMixin, OAuthLibMixin, View):
+class ProtectedResourceView(ProtectedResourceMixin, View):
     """
     Generic view protecting resources by providing OAuth2 authentication out of the box
     """
@@ -35,7 +34,7 @@ class ReadWriteScopedResourceView(ReadWriteScopedResourceMixin, ProtectedResourc
     pass
 
 
-class ClientProtectedResourceView(ClientProtectedResourceMixin, OAuthLibMixin, View):
+class ClientProtectedResourceView(ClientProtectedResourceMixin, View):
     """View for protecting a resource with client-credentials method.
     This involves allowing access tokens, Basic Auth and plain credentials in request body.
     """