Issue #27714: Remove unneeded non-idempotent call that fails on retest.

Lib/idlelib/idle_test/test_autocomplete.py

@@ -4,7 +4,6 @@ from tkinter import Tk, Text
 
 import idlelib.AutoComplete as ac
 import idlelib.AutoCompleteWindow as acw
-import idlelib.macosxSupport as mac
 from idlelib.idle_test.mock_idle import Func
 from idlelib.idle_test.mock_tk import Event
 
@@ -27,7 +26,6 @@ class AutoCompleteTest(unittest.TestCase):
     def setUpClass(cls):
         requires('gui')
         cls.root = Tk()
-        mac.setupApp(cls.root, None)
         cls.text = Text(cls.root)
         cls.editor = DummyEditwin(cls.root, cls.text)