Inconsistent access/ synchronization on Authenticator.theAuthenticator

[Dawid Weiss]

This is very minor, but java.net.Authenticator has the following
static field for the default authenticator:

    private static Authenticator theAuthenticator;

This field is set from a synchronized method setDefault(..), but
accessed without proper sync from all other request* methods:

Authenticator a = theAuthenticator;
if (a == null) {
  return null;
}

D.