Revert "dart:io | Change two secure networking tests to account for the session cache."

tests/standalone/io/https_bad_certificate_client.dart

Index: tests/standalone/io/https_bad_certificate_client.dart
diff --git a/tests/standalone/io/https_bad_certificate_client.dart b/tests/standalone/io/https_bad_certificate_client.dart
index 4028ebc33feedf277769c5f3c9449a38452007fe..4fe59a95b61d939b050ff698ad7943cd22d3eefc 100644
--- a/tests/standalone/io/https_bad_certificate_client.dart
+++ b/tests/standalone/io/https_bad_certificate_client.dart
@@ -62,7 +62,7 @@ Future runHttpClient(int port, result) {
   client.badCertificateCallback = null;
   testFutures.add(client.getUrl(Uri.parse('https://$HOST_NAME:$port/$result'))
     .then((HttpClientRequest request) {
-      expect(result == 'true');  // The session cache may keep the last connection.
+      expect(false);
     }, onError: (e) {
       expect(e is HandshakeException || e is SocketException);
     }));