Review request for JDK-8129959: DebugLogger has unnecessary API methods

[Attila Szegedi]

Please review JDK-8129959 "DebugLogger has unnecessary API methods" at 
<http://cr.openjdk.java.net/~attila/8129959/webrev.jdk9> for 
<https://bugs.openjdk.java.net/browse/JDK-8129959>

Thanks,
  Attila.