Fix a few places that broke due to a recent change to io.py.
diff --git a/Lib/test/test_urllib2.py b/Lib/test/test_urllib2.py
index dff840e..22979f6 100644
--- a/Lib/test/test_urllib2.py
+++ b/Lib/test/test_urllib2.py
@@ -673,7 +673,7 @@
                 self.assertEqual(req.type, "ftp")
 
     def test_http(self):
-        class MockHTTPResponse:
+        class MockHTTPResponse(io.IOBase):
             def __init__(self, fp, msg, status, reason):
                 self.fp = fp
                 self.msg = msg