See #1977: Delete DoneAndNotDoneFutures definition (#1978)

The generic type of the futures provided to the wait method cannot
currently be preserved through this definition. For now deleting the
unused NamedTuple is the best approach.

Author: matthewfranglen

stdlib/3/concurrent/futures/_base.pyi

@@ -14,8 +14,6 @@ class Error(Exception): ...
 class CancelledError(Error): ...
 class TimeoutError(Error): ...
 
-DoneAndNotDoneFutures = NamedTuple('DoneAndNotDoneFutures', [('done', Future[Any]), ('not_done', Future[Any])])
-
 _T = TypeVar('_T')
 
 class Future(Generic[_T]):