hg: jdk8/tl/jdk: 7165118: (prefs) AbstractPreferences.remove(null) does not throw NPE

[kurchi . subhra . hazra]

Changeset: 59121a4c71c6
Author:    khazra
Date:      2012-05-09 11:14 -0700
URL:       http://hg.openjdk.java.net/jdk8/tl/jdk/rev/59121a4c71c6

7165118: (prefs) AbstractPreferences.remove(null) does not throw NPE
Summary: Insert null argument check in AbstractPreferences.remove()
Reviewed-by: dholmes, chegar, alanb

! src/share/classes/java/util/prefs/AbstractPreferences.java
! test/java/util/prefs/RemoveNullKeyCheck.java