More progress in the &JSRef -> JSRef conversion

Change all of the <Class>Methods traits to take `self` instead of
`&self`.

components/script/dom/range.rs

@@ -39,7 +39,7 @@ impl Range {
 
 impl<'a> RangeMethods for JSRef<'a, Range> {
     /// http://dom.spec.whatwg.org/#dom-range-detach
-    fn Detach(&self) {
+    fn Detach(self) {
         // This method intentionally left blank.
     }
 }