From 9190866b939d910c36de41b6319d1e5ef5668809 Mon Sep 17 00:00:00 2001
From: Nathan Froyd <froydnj@gmail.com>
Date: Tue, 7 Jun 2016 04:10:25 -0400
Subject: [PATCH] Bug 1277890 - part 1 - avoid unnecessary refcounting when
 building the filters list; r=baku

We can pass the atom reference we have into the filter list, there's no
need for the filter list to retain a separate reference of the atom.
---
 dom/base/nsDOMMutationObserver.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/dom/base/nsDOMMutationObserver.cpp b/dom/base/nsDOMMutationObserver.cpp
index 0a5a14a9d92e..45d9495cb00b 100644
--- a/dom/base/nsDOMMutationObserver.cpp
+++ b/dom/base/nsDOMMutationObserver.cpp
@@ -685,8 +685,7 @@ nsDOMMutationObserver::Observe(nsINode& aTarget,
     filters.SetCapacity(len);
 
     for (uint32_t i = 0; i < len; ++i) {
-      nsCOMPtr<nsIAtom> a = NS_Atomize(filtersAsString[i]);
-      filters.AppendObject(a);
+      filters.AppendElement(NS_Atomize(filtersAsString[i]));
     }
   }