JDK 9 RFR of 8033525 : Fix raw and unchecked lint warnings in sun.swing.*

[Joe Darcy]

Hello,

Please review the webrev below which address ~50 raw and unchecked javac 
lint warnings in sun.swing.*:

    8033525 : Fix raw and unchecked lint warnings in sun.swing.*
    http://cr.openjdk.java.net/~darcy/8033525.0/

That code in sun.swing.* compiles cleanly with the raw, cast, and 
unchecked lint warnings enabled (incomplete fixes for raw and unchecked 
issues can lead to cast issues) and the jdk repo rebuilds cleanly with 
this patch applied.

Thanks,

-Joe