[9] Review request for 8075516: Deleting a file from either the open or save java.awt.FileDialog hangs.

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:
bug: https://bugs.openjdk.java.net/browse/JDK-8075516
webrev: http://cr.openjdk.java.net/~ssadetsky/8075516/webrev.00/
In Windows 8 OFN dialog starts to use COM requests internally. Since 
that the SendMessage request to the Toolkit thread cannot be used due to 
inability of COM to marshal an outgoing call while processing the 
SendMessage. It causes RPC_E_CANTCALLOUT_ININPUTSYNCCALL error.
As a solution SendMessage is replaced with PostMessage.

--Semyon