hg: openjfx/9-dev/rt: 8146916: FXCollections.unmodifiableObservableSet does not implement Set::contains

[vadim.pakhnushev at oracle.com]

Changeset: 410a6fbaf4df
Author:    vadim
Date:      2016-01-15 19:28 +0300
URL:       http://hg.openjdk.java.net/openjfx/9-dev/rt/rev/410a6fbaf4df

8146916: FXCollections.unmodifiableObservableSet does not implement Set::contains
Reviewed-by: kcr

! modules/base/src/main/java/javafx/collections/FXCollections.java