Remove default allowed contact method

activity.py

@@ -69,18 +69,3 @@ class Activity:
         if opportunity_party_id:
             return opportunity_party_id
         return super(Activity, cls).default_party()
-
-    # TODO: On 3.4 not necessary any more.
-    @classmethod
-    def default_allowed_contacts(cls):
-        pool = Pool()
-        Activity = pool.get('activity.activity')
-        Party = pool.get('party.party')
-        activity = Activity()
-        party_id = cls.default_party()
-        if party_id:
-            activity.party = Party(cls.default_party())
-        else:
-            activity.party = None
-        allowed = activity.on_change_with_allowed_contacts()
-        return allowed