auto merge of #4817 : Ms2ger/servo/to_js, r=jdm

They are unused.

components/script/dom/bindings/codegen/CodegenRust.py

@@ -5268,17 +5268,6 @@ pub trait ${castTraitName} : Sized {
         }
     }
 
-    #[inline(always)]
-    #[allow(unrooted_must_root)]
-    fn to_js<T: ${toBound}+Reflectable>(base: &JS<T>) -> Option<JS<Self>> {
-        unsafe {
-            match (*base.unsafe_get()).${checkFn}() {
-                true => Some(base.transmute_copy()),
-                false => None
-            }
-        }
-    }
-
     #[inline(always)]
     #[allow(unrooted_must_root)]
     fn to_layout_js<T: ${toBound}+Reflectable>(base: &LayoutJS<T>) -> Option<LayoutJS<Self>> {