Code Review Request for Bug #4802647

[Brandon Passanisi]

Hello core-libs-dev at openjdk.java.net.  Please review the following patch 
to fix Bug 4802647 (coll) NullPointerException not thrown by 
AbstractCollection.retainAll/removeAll:  The fix is quite small and I 
have included a test program, all of which can be found within the 
following webrev:

    http://cr.openjdk.java.net/~mduigou/4802647/0/webrev/

Thanks.
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