RFR: 8240287: SelectedItemsReadOnlyObservableList cleanup: remove unused code.

[Kevin Rushforth]

On Mon, 2 Mar 2020 09:26:19 GMT, Ambarish Rapte <arapte at openjdk.org> wrote:

> The below member variables and method of class SelectedItemsReadOnlyObservableList are not required anymore.
> Variables: itemsList, itemsListChanged, itemsListChange, itemsListListener.
> Method: setItemsList
> 
> These members were added when this class was created for [JDK-8154216](https://bugs.openjdk.java.net/browse/JDK-8154216).
> But after the fix for [JDK-8152396](https://bugs.openjdk.java.net/browse/JDK-8152396), these class members are not required.
> This change also fixes the leak issue : [JDK-8237926](https://bugs.openjdk.java.net/browse/JDK-8237926)
> 
> Verification:
> No build and test failures.

As I mentioned in the bug report for [JDK-8240287](https://bugs.openjdk.java.net/browse/JDK-8240287), I recommend using [JDK-8227619](https://bugs.openjdk.java.net/browse/JDK-8227619) as the bug ID for this fix (and closing JDK-8240287 in JBS as a duplicate). I think that you should be able to just change the title of this PR.

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PR: https://git.openjdk.java.net/jfx/pull/132