Review request for 7124262: [macosx] Drag events go to a wrong child.

[Alexander Zuev]

Hello,

   please review my fix for bug 7124262: [macosx] Drag events go to a 
wrong child.

   Bug description is 
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7124262

   Webrev can be found here:
http://cr.openjdk.java.net/~kizune/7124262/webrev.00/

   We are incorrectly registering DropTarget listener in the 
LWComponentPeer even if peer is not the LWWindowPeer
and because of that we are overriding the listener created for the 
window itself so all the events come to the last added
AWT component.

With best regards,
Alexander Zuev