Don't try to set the exception port for server connections
https://bugs.webkit.org/show_bug.cgi?id=113910
<rdar://problem/11248925>

Reviewed by Darin Adler.

Treat a SetExceptionPort message to the server connection as an invalid message.

* Platform/CoreIPC/mac/ConnectionMac.cpp:
(CoreIPC::Connection::receiveSourceEventHandler):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147598 268f45cc-cd09-0410-ab3c-d52691b4dbfc