1) Use GetWeak() on the queue hashtable where possible
2) Fix what looks like a bug in CreateEventQueue (passing wrong thread
to MakeNewQueue).
3) Fix what looks like a bug in PushThreadEventQueue (looking at the original
queue for the thread rather than the youngest one).
Bug 230092, r=danm, sr=darin
git-svn-id: svn://10.0.0.236/trunk@151986 18797224-902f-48f8-a5cc-f745e15eee43