diff -r 000000000000 -r 6474c204b198 dom/bindings/NonRefcountedDOMObject.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/bindings/NonRefcountedDOMObject.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,37 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
+/* vim: set ts=2 sw=2 et tw=79: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_NonRefcountedDOMObject_h__
+#define mozilla_dom_NonRefcountedDOMObject_h__
+
+#include "nsISupportsImpl.h"
+
+namespace mozilla {
+namespace dom {
+
+// Natives for DOM classes with 'owned' as the value for nativeOwnership in
+// Bindings.conf need to inherit from this class.
+// If you're seeing objects of this class leak then natives for one of the DOM
+// classes with 'owned' as the value for nativeOwnership in Bindings.conf is
+// leaking. If the native for that class has MOZ_COUNT_CTOR/DTOR in its
+// constructor/destructor then it should show up in the leak log too.
+class NonRefcountedDOMObject
+{
+protected:
+  NonRefcountedDOMObject()
+  {
+    MOZ_COUNT_CTOR(NonRefcountedDOMObject);
+  }
+  ~NonRefcountedDOMObject()
+  {
+    MOZ_COUNT_DTOR(NonRefcountedDOMObject);
+  }
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif /* mozilla_dom_NonRefcountedDOMObject_h__ */