[openjfx11] Review request for 8206995: Remove unused WebKit files

[Arunprasad Rajkumar]

Hi,

Please review the fix for following bug,

Bug: https://bugs.openjdk.java.net/browse/JDK-8206995

Patch: https://bugs.openjdk.java.net/secure/attachment/77667/rt.patch

Thanks,
Arun