Remove an unrequired TODO in test_urllib2. (#897) (#901)

(cherry picked from commit e6911a4)

Author: orsenthil

Lib/test/test_urllib2.py

@@ -1341,7 +1341,6 @@ def test_proxy_https_proxy_authorization(self):
         self.assertEqual(req.host, "proxy.example.com:3128")
         self.assertEqual(req.get_header("Proxy-authorization"), "FooBar")
 
-    # TODO: This should be only for OSX
     @unittest.skipUnless(sys.platform == 'darwin', "only relevant for OSX")
     def test_osx_proxy_bypass(self):
         bypass = {