[9] Review request for 8155001: SystemTray.remove() leaks GDI Objects in Windows

[dmitry markov]

Hello,

Could you review the fix for jdk9, please?
    bug: https://bugs.openjdk.java.net/browse/JDK-8155001
    webrev: http://cr.openjdk.java.net/~dmarkov/8155001/webrev.00/

Problem description:
When TrayIcon is removed from SystemTray, dispose() method will be 
called for its peer and corresponding native objects. However HICON 
object is not deleted during dispose() invocation. That causes the leak 
of GDI objects.

Fix:
Dispose() in awt_TrayIcon.cpp should call DestroyIcon() to avoid leak of 
GDI objects.

Thanks,
Dmitry