RFR: 8323284: Remove unused FilteringClosure declaration

[Albert Mingkun Yang]

On Tue, 9 Jan 2024 12:58:24 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial removing dead code.

Thanks for the review.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/17323#issuecomment-1883139898