[jdk21u] RFR: 8365389: Remove static color fields from SwingUtilities3 and WindowsMenuItemUI

[Andrew John Hughes]

On Thu, 25 Sep 2025 10:07:28 GMT, Goetz Lindenmaier <goetz at openjdk.org> wrote:

> I'd like to bring this late to 21 to assure the regression introduced by [JDK-8348760](https://bugs.openjdk.org/browse/JDK-8348760) doesn't get into the product.
> Unfortunately the follow-up change [JDK-8365625](https://bugs.openjdk.org/browse/JDK-8365625) is not yet pushed.
> Also, OpenJDK 21 will be ahead of OpenJDK 25, as I doubt this change will make it to 25.0.1.

Confirmed clean and tests look good. Just waiting for approval request.

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Marked as reviewed by andrew (Reviewer).

PR Review: https://git.openjdk.org/jdk21u/pull/470#pullrequestreview-3269503348