Bug 1354047 - Allocate DOMRect and DOMRectReadOnly wrappers from nursery, r=qDot

--HG--
extra : rebase_source : 5938f6053879fcd8777ae9d2454995152b78e4a2

dom/webidl/DOMRect.webidl

@@ -20,6 +20,7 @@ interface DOMRect : DOMRectReadOnly {
     inherit attribute unrestricted double height;
 };
 
+[ProbablyShortLivingWrapper]
 interface DOMRectReadOnly {
     readonly attribute unrestricted double x;
     readonly attribute unrestricted double y;