CLN: Remove dead code in api/test_types.py (#24516)

Follow-up to gh-19769.

Author: gfyoung

pandas/tests/api/test_types.py

@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-import pytest
-
 from pandas.api import types
 from pandas.util import testing as tm
 
@@ -35,19 +33,6 @@ def test_types(self):
 
         self.check(types, self.allowed + self.dtypes + self.deprecated)
 
-    def check_deprecation(self, fold, fnew):
-        with tm.assert_produces_warning(DeprecationWarning):
-            try:
-                result = fold('foo')
-                expected = fnew('foo')
-                assert result == expected
-            except TypeError:
-                with pytest.raises(TypeError):
-                    fnew('foo')
-            except AttributeError:
-                with pytest.raises(AttributeError):
-                    fnew('foo')
-
     def test_deprecated_from_api_types(self):
 
         for t in self.deprecated: