hg: jdk/sandbox: More cleanup and elimination of unused code

[alan.bateman at oracle.com]

Changeset: 7636aef1b197
Author:    alanb
Date:      2019-03-02 11:44 +0000
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/7636aef1b197

More cleanup and elimination of unused code

! src/java.base/share/classes/java/net/AbstractPlainSocketImpl.java
! src/java.base/share/classes/java/net/ServerSocket.java
! src/java.base/share/classes/java/net/SocketImpl.java
! src/java.base/share/classes/sun/nio/ch/NioSocketImpl.java