bug 490425 fix nsView crash, patch from Martin Stransky, r/sr=roc

view/src/nsView.cpp

@@ -164,7 +164,8 @@ nsEventStatus HandleEvent(nsGUIEvent *aEvent)
 
   if (view)
   {
-    view->GetViewManager()->DispatchEvent(aEvent, &result);
+    nsCOMPtr<nsIViewManager> vm = view->GetViewManager();
+    vm->DispatchEvent(aEvent, &result);
   }
 
   return result;