[Qt] Fix Win build after r141177
https://bugs.webkit.org/show_bug.cgi?id=108325

Patch by Zoltan Arvai <zarvai@inf.u-szeged.hu> on 2013-01-30
Reviewed by Anders Carlsson.

* Platform/CoreIPC/win/ConnectionWin.cpp:
(CoreIPC::Connection::readEventHandler):
(CoreIPC::Connection::sendOutgoingMessage):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141287 268f45cc-cd09-0410-ab3c-d52691b4dbfc