Replace uses of JS<T>.unrooted() with JS::from_rooted #2580

src/components/script/dom/attr.rs

@@ -88,7 +88,7 @@ impl Attr {
             name: name, //TODO: Intern attribute names
             namespace: namespace,
             prefix: prefix,
-            owner: Cell::new(owner.unrooted()),
+            owner: Cell::new(JS::from_rooted(owner)),
         }
     }