RFR: 8228394: Cleanup unused java.net SharedSecrets classes

[Chris Hegarty]

> On 19 Jul 2019, at 13:51, Claes Redestad <claes.redestad at oracle.com> wrote:
> 
> Hi,
> 
> please review this cleanup to remove a few java.net access objects that
> are no longer in use.
> 
> Webrev: http://cr.openjdk.java.net/~redestad/8228394/open.00/
> Bug:    https://bugs.openjdk.java.net/browse/JDK-8228394

Nice cleanup! Reviewed.

-Chris.