hg: jdk/sandbox: http-client-branch: cleanup: add missing @Overrides

[daniel.fuchs at oracle.com]

Changeset: 5683757b6771
Author:    dfuchs
Date:      2017-12-15 10:31 +0000
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/5683757b6771

http-client-branch: cleanup: add missing @Overrides

! src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/Http2Connection.java