process_test: Remove reference to deleted LayeredTwistedIOLoop

tornado/test/process_test.py

@@ -9,7 +9,6 @@
 
 from tornado.httpclient import HTTPClient, HTTPError
 from tornado.httpserver import HTTPServer
-from tornado.ioloop import IOLoop
 from tornado.log import gen_log
 from tornado.process import fork_processes, task_id, Subprocess
 from tornado.simple_httpclient import SimpleAsyncHTTPClient
@@ -141,15 +140,6 @@ def term_and_wait(self, subproc):
 
     @gen_test
     def test_subprocess(self):
-        if IOLoop.configured_class().__name__.endswith("LayeredTwistedIOLoop"):
-            # This test fails non-deterministically with LayeredTwistedIOLoop.
-            # (the read_until('\n') returns '\n' instead of 'hello\n')
-            # This probably indicates a problem with either TornadoReactor
-            # or TwistedIOLoop, but I haven't been able to track it down
-            # and for now this is just causing spurious travis-ci failures.
-            raise unittest.SkipTest(
-                "Subprocess tests not compatible with " "LayeredTwistedIOLoop"
-            )
         # In Python 3.13.0b1, the new repl logs an error on exit if terminfo
         # doesn't exist, the -i flag is used, and stdin is not a tty. This bug may
         # have been fixed in beta 2, so for now we disable the new repl in this test