hg: jdk/sandbox: 8183040: update jdk/test/lib/Platform.java to use NIO file

[chris.hegarty at oracle.com]

Changeset: 1644cf7879a5
Author:    iignatyev
Date:      2020-06-10 13:15 -0700
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/1644cf7879a5

8183040: update jdk/test/lib/Platform.java to use NIO file
Reviewed-by: amenkov, bpb

! test/lib/jdk/test/lib/Platform.java
! test/lib/jdk/test/lib/SA/SATestUtils.java