servo: Merge #3684 - Add #[dom_struct], inline autogenerated trace() methods (from Manishearth:dom_struct); r=jdm

This attribute implies #[jstraceable], #[privatize], and #[must_root].

Source-Repo: https://github.com/servo/servo
Source-Revision: 9af090006017747809f5f72a8870bd516b20f483

servo/components/script/dom/documentfragment.rs

@@ -18,9 +18,7 @@ use dom::node::{DocumentFragmentNodeTypeId, Node, NodeHelpers, window_from_node}
 use dom::nodelist::NodeList;
 use servo_util::str::DOMString;
 
-#[jstraceable]
-#[must_root]
-#[privatize]
+#[dom_struct]
 pub struct DocumentFragment {
     node: Node,
 }