RFR: 6513512: MetalLookAndFeel.initClassDefaults does not install an entry for MetalMenuBarUI [v4]

[Prasanta Sadhukhan]

On Fri, 3 Feb 2023 17:56:17 GMT, Phil Race <prr at openjdk.org> wrote:

> What would happen if you DID register all Metal*UI classes for all themes ?
> Even if it isn't used, what would go wrong ?

Well, I did try registering MetalMenuBarUI in MetalLookAndFeel.initClassDefaults (as you can see in the 1st iteration of this PR) and I do not see any regression in jtreg tests. Then it was pointed out to me that the spec, instead, need to be updated to specify it is only for OceanTheme

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PR: https://git.openjdk.org/jdk/pull/11646