RFR: JDK-8307807 Replace use of System.getProperty("os.name") with PlatformUtil calls

[Carl Döbbelin]

On Thu, 11 May 2023 15:43:30 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

> > I cannot use the PlatformUtils in the `com.sun.webkit.network.URLLoader` class, as the PlatformUtils are not Exported to the corresponding module.
> 
> I wonder if this was done on purpose.

i assumed it was.

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PR Comment: https://git.openjdk.org/jfx/pull/1132#issuecomment-1544280412