Backing out the fix to bug 390706, caused increased leakage

toolkit/components/places/src/nsNavBookmarks.cpp

@@ -2532,9 +2532,6 @@ nsNavBookmarks::RemoveObserver(nsINavBookmarkObserver *aObserver)
 nsresult
 nsNavBookmarks::OnQuit()
 {
-  // remove observers on shutdown
-  mObservers.Clear();
-
   return NS_OK;
 }