remove unneeded parent change notification r/sr=sspitzer

mailnews/db/msgdb/src/nsMsgThread.cpp

@@ -501,9 +501,10 @@ nsresult nsMsgThread::ReparentChildrenOf(nsMsgKey oldParent, nsMsgKey newParent,
 
 					curHdr->SetThreadParent(newParent);
 					curHdr->GetMessageKey(&curKey);
+#ifdef NEEDED // I don't think we care anymore
 					if (announcer)
 						announcer->NotifyParentChangedAll(curKey, oldParent, newParent, nsnull);
-
+#endif
 					// if the old parent was the root of the thread, then only the first child gets 
 					// promoted to root, and other children become children of the new root.
 					if (newParent == nsMsgKey_None)