RFR: 8358035: Remove unused `compute_fingerprint` declaration in `ClassFileStream`

[Qizheng Xing]

On Thu, 29 May 2025 18:54:09 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> In JDK-8264805 (part of JEP 410), the implementation of `compute_fingerprint` was removed from `ClassFileStream`, but its declaration was left in place, which was unused and should be removed. This patch removes that declaration.
>
> Looks good.

@calvinccheung @iklam Thank you for the review!

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PR Comment: https://git.openjdk.org/jdk/pull/25518#issuecomment-2933066645