collections.abc.tests: Remove some unnecessary code.

Lib/test/test_collections.py

@@ -503,14 +503,11 @@ class TestOneTrickPonyABCs(ABCTestCase):
             def close(self):
                 pass
         Coroutine.register(CoroLike)
-        try:
         self.assertTrue(isinstance(CoroLike(), Awaitable))
         self.assertTrue(issubclass(CoroLike, Awaitable))
         CoroLike = None
-        finally:
         support.gc_collect() # Kill CoroLike to clean-up ABCMeta cache
 
-
     def test_Coroutine(self):
         def gen():
             yield