RFR:8208531 : -javafx mode should be on by default when JavaFX is available

[Priya Lakshmi Muthuswamy]

Hi,

Kindly review the fix for https://bugs.openjdk.java.net/browse/JDK-8208531
webrev : http://cr.openjdk.java.net/~pmuthuswamy/8208531/webrev.00/
CSR: https://bugs.openjdk.java.net/browse/JDK-8208532/

Thanks,
Priya