JDK 9 RFR of JDK-8033908: Fix serial lint warnings in com.sun.java.swing.plaf

[Joe Darcy]

Hello,

Please review the webrev to address

    JDK-8033908: Fix serial lint warnings in com.sun.java.swing.plaf
    http://cr.openjdk.java.net/~darcy/8033908.0/

Thanks,

-Joe