Revert "Start adding TLS (SSL) sockets to dart:io."

runtime/bin/tls_socket.dart

Index: runtime/bin/tls_socket.dart
diff --git a/runtime/bin/tls_socket.dart b/runtime/bin/tls_socket.dart
deleted file mode 100644
index f3ec9ab67b6196915155709e53ef797f9a154ce0..0000000000000000000000000000000000000000
--- a/runtime/bin/tls_socket.dart
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-interface TlsSocket extends Socket, Hashable default _TlsSocket {
-  /**
-   * Constructs a new secure socket and connect it to the given
-   * host on the given port. The returned socket is not yet connected
-   * but ready for registration of callbacks.
-   */
-  TlsSocket(String host, int port);
-}