[9] Review Request: 8042219 [macosx] LWComponentPeer should not reference classes from sun.lwawt.macosx

[Petr Pchelko]

Hello, AWT Team.

Please review a simple cleanup fix for the issue:
https://bugs.openjdk.java.net/browse/JDK-8042219
The fix is available here:
http://cr.openjdk.java.net/~pchelko/9/8042219/webrev/

We should not reference macosx classes in lwawt package. I've also cleaned up 
CDropTarget class a bit.

Thank you.
With best regards. Petr.