Undo the deprecation of _asdict().

Backed out changeset c4ca39bece9d
diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
index 12bd952..8033031 100644
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -217,11 +217,8 @@
         self.assertEqual(p, Point._make([11, 22]))                          # test _make classmethod
         self.assertEqual(p._fields, ('x', 'y'))                             # test _fields attribute
         self.assertEqual(p._replace(x=1), (1, 22))                          # test _replace method
-        self.assertEqual(p.__dict__,
-                         OrderedDict([('x', 11), ('y', 22)]))               # test __dict__ attribute
-        self.assertEqual(vars(p), p.__dict__)                               # verify that vars() works
-        with self.assertWarns(DeprecationWarning):                          # check deprecate of _asdict
-            p._asdict()
+        self.assertEqual(p._asdict(), dict(x=11, y=22))                     # test _asdict method
+        self.assertEqual(vars(p), p._asdict())                              # verify that vars() works
 
         try:
             p._replace(x=1, error=2)