[jfx17u] RFR: 8268849: Update to 612.1 version of WebKit

[Kevin Rushforth]

On Mon, 13 Sep 2021 19:53:47 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Clean backport to `jfx17u`. This has been tested on all platforms along with other pending fixes in the `test-kcr-17.0.1` branch.

Thanks for the review and the sanity check.

> There are only differences of copyright year. jfx17 files have 2021 in copyright year.

Right. The copyright updates in the `jfx:master` branch were done subsequent to this. Once I have backported the remaining two webkit fixes, the HEAD of jfx17u:master and jfx:master should be identical for the native webkit sources.

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PR: https://git.openjdk.java.net/jfx17u/pull/3