RFR: 8334726: Remove accidentally exposed individual methods from Class-File API

[Adam Sotona]

On Fri, 21 Jun 2024 14:38:44 GMT, Chen Liang <liach at openjdk.org> wrote:

> In preparation of Class-File API exiting review, we are housekeeping our API surface. These 3 method removals are the most obvious and simple ones.
> 
> This is separated from more throughout and (possibly controversial) changes for the future, to make reviews (both code and CSR) easier.

Looks good to me, thanks.

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Marked as reviewed by asotona (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19832#pullrequestreview-2132887472