Remove changes to list tests.

Author: ZeroIntensity

Lib/test/test_list.py

@@ -1,6 +1,5 @@
 import sys
 from test import list_tests
-from test import support
 from test.support import cpython_only
 import pickle
 import unittest
@@ -310,6 +309,5 @@ def test_tier2_invalidates_iterator(self):
             a.append(4)
             self.assertEqual(list(it), [])
 
-
 if __name__ == "__main__":
     unittest.main()