Backport b533cc11d114 to fix intermittent test_urllibnet failures.

Lib/test/test_urllibnet.py

@@ -104,7 +104,7 @@ class urlopenNetworkTests(unittest.TestCase):
             # test can't pass on Windows.
             return
         # Make sure fd returned by fileno is valid.
-        with self.urlopen("http://www.example.com/", timeout=None) as open_url:
+        with self.urlopen("http://www.google.com/", timeout=None) as open_url:
             fd = open_url.fileno()
             with os.fdopen(fd, 'rb') as f:
                 self.assertTrue(f.read(), "reading from file created using fd "