hg: jdk9/sandbox/jdk: http-client-branch: fix ImmutableHeaders test

[chris.hegarty at oracle.com]

Changeset: 4184f4e100e3
Author:    chegar
Date:      2016-08-11 16:10 +0100
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/4184f4e100e3

http-client-branch: fix ImmutableHeaders test

! test/java/net/httpclient/ImmutableHeaders.java