RFR: JDK-8299977 : Update WebKit to 615.1 [v2]

[Joeri Sykora]

On Mon, 30 Jan 2023 15:11:20 GMT, Hima Bindu Meda <hmeda at openjdk.org> wrote:

>> Update JavaFX WebKit to GTK WebKit 2.38 (615.1).
>> 
>> Verified the updated version build, sanity tests and stability.
>> This does not cause any issues except one unit test failure.
>> Also, there are some artifacts observed while playing youtube
>> 
>> The above issues are recorded and ignored using below bugs:
>> [JDK-8300954](https://bugs.openjdk.org/browse/JDK-8300954)
>> [JDK-8301022](https://bugs.openjdk.org/browse/JDK-8301022)
>
> Hima Bindu Meda has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add blank lines

Building and testing succeeded on linux, mac and windows x86_64.

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Marked as reviewed by sykora (Author).

PR: https://git.openjdk.org/jfx/pull/1011