Remove doublepointer in VirtualMethods, and from_borrowed_ref

Most of the heavy lifting done by:

```
$ ls *rs | xargs gawk -i inplace '/let .*: &&.*from_borrowed_ref/{sub("&&", "\\&");sub("_borrowed_","_");} {print $0}'
$ ls *rs | xargs gawk -i inplace "/impl.*VirtualMethods/{in_vm=1; sub(/<'a>/,\"\");sub(/&'a /,\"\")} /^}\$/{in_vm=0;} in_vm{\$0=gensub(/\\*self([^.])/,\"self\\\1\",\"g\"); sub(/from_borrowed_ref/,\"from_ref\")} {print}"
```

1 files changed, 3 insertions, 3 deletions

diff --git a/components/script/dom/userscripts.rs b/components/script/dom/userscripts.rs
index c8fce99002c..c82f640e1ed 100644
--- a/components/script/dom/userscripts.rs
+++ b/components/script/dom/userscripts.rs
@@ -18,7 +18,7 @@ use util::resource_files::resources_dir_path;
 
 pub fn load_script(head: &HTMLHeadElement) {
     if let Some(ref path_str) = opts::get().userscripts {
-        let node = NodeCast::from_borrowed_ref(&head);
+        let node = NodeCast::from_ref(head);
         let first_child = node.GetFirstChild();
         let doc = node.owner_doc();
         let doc = doc.r();
@@ -45,8 +45,8 @@ pub fn load_script(head: &HTMLHeadElement) {
             let new_script = doc.CreateElement("script".to_owned()).unwrap();
             let new_script = new_script.r();
             new_script.set_string_attribute(&atom!("src"), name);
-            let new_script_node = NodeCast::from_borrowed_ref(&new_script);
-            node.InsertBefore(*new_script_node, first_child.r()).unwrap();
+            let new_script_node = NodeCast::from_ref(new_script);
+            node.InsertBefore(new_script_node, first_child.r()).unwrap();
         }
     }
 }