RFR: 8263905: Remove finalize methods for SocketInput/OutputStream

[Kim Barrett]

Please review this change to java.net.SocketInputStream and
java.net.SocketOutputStream, removing their "finalize" methods.  These
methods are empty.  Their purpose is to override and suppress the finalize
methods of their superclasses (FileInputStream and FileOutputStream,
respectively).  But those classes had their finalize methods removed by
JDK-8192939 in JDK 12.

-------------

Commit messages:
 - remove finalize methods

Changes: https://git.openjdk.java.net/jdk/pull/3111/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3111&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263905
  Stats: 14 lines in 2 files changed: 0 ins; 12 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3111.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3111/head:pull/3111

PR: https://git.openjdk.java.net/jdk/pull/3111