RFR: 8325361: Make sun.net.www.MessageHeader final

[Daniel Fuchs]

On Thu, 29 Feb 2024 12:16:38 GMT, Korov <duke at openjdk.org> wrote:

> Make sun.net.www.MessageHeader final, and remove `@SuppressWarnings("this-escape")`

This looks good to me @Korov . Give me some time to send that change to our test farms and double check it causes no issues.

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PR Review: https://git.openjdk.org/jdk/pull/18060#pullrequestreview-1908743372