RFR: 8357686: Remove unnecessary Map.get from AWTAutoShutdown.unregisterPeer

[Sergey Bylokhov]

On Thu, 24 Apr 2025 20:18:01 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> Instead of separate `.get(Key)`+`.remove(Key)` calls we can call `.remove(Key, Value)`.
> `peerMap` is an `IdentityHashMap`. IdentityHashMap.remove compares values with == since Java 20 ([JDK-8178355](https://bugs.openjdk.org/browse/JDK-8178355))

Marked as reviewed by serb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/24858#pullrequestreview-2924156759