Mark all private functions in dart: libraries as invisible (*sniff*).

sdk/lib/io/secure_socket.dart

Index: sdk/lib/io/secure_socket.dart
diff --git a/sdk/lib/io/secure_socket.dart b/sdk/lib/io/secure_socket.dart
index ac029789f033157c1d2bb6368eeccbb0efa67f3b..44d60849c1bad597ea44f161f6b2a0baeb3e8c8e 100644
--- a/sdk/lib/io/secure_socket.dart
+++ b/sdk/lib/io/secure_socket.dart
@@ -1162,7 +1162,7 @@ class _RawSecureSocket extends Stream<RawSocketEvent>
       args[2 * i + 3] = bufs[i].end;
     }
 
-    return _IOService.dispatch(_SSL_PROCESS_FILTER, args).then((response) {
+    return _IOService._dispatch(_SSL_PROCESS_FILTER, args).then((response) {
       if (response.length == 2) {
         _reportError(new TlsException('${response[1]} error ${response[0]}'),
                      null);