hg: jdk/submit: 8216478: Cleanup HttpResponseImpl back reference to HttpConnection

[daniel.fuchs at oracle.com]

Changeset: 14d078fd74cb
Author:    dfuchs
Date:      2019-01-14 10:46 +0000
URL:       http://hg.openjdk.java.net/jdk/submit/rev/14d078fd74cb

8216478: Cleanup HttpResponseImpl back reference to HttpConnection
Summary: Retain a reference to Exchange and HttpConnection only when necessary, i.e. for WebSocket initial connection.
Reviewed-by: chegar

! src/java.net.http/share/classes/jdk/internal/net/http/HttpResponseImpl.java