RFR: 8300977: Retire java.io.ExpiringCache [v2]

[Alan Bateman]

On Tue, 28 Mar 2023 06:55:26 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> This PR proposed to retire the class 'java.io.ExpiringCache'. The use of the class has been off by default since Java 16 but could be explicitly turned on by means of two System properties.
>
> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revert change after comments

Marked as reviewed by alanb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/12167#pullrequestreview-1360760097