servo: Merge #8295 - Various cleanup (from Ms2ger:cleanup); r=jdm

Source-Repo: https://github.com/servo/servo
Source-Revision: 1794e5875a1d1e61f00f7d0d0592fc5f7cd278d7

servo/components/script/devtools.rs

@@ -155,12 +155,12 @@ pub fn handle_modify_attribute(page: &Rc<Page>,
     let node = find_node_by_unique_id(&*page, pipeline, node_id);
     let elem = node.downcast::<Element>().expect("should be getting layout of element");
 
-    for modification in &modifications {
+    for modification in modifications {
         match modification.newValue {
-            Some(ref string) => {
-                let _ = elem.SetAttribute(modification.attributeName.clone(), string.clone());
+            Some(string) => {
+                let _ = elem.SetAttribute(modification.attributeName, string);
             },
-            None => elem.RemoveAttribute(modification.attributeName.clone()),
+            None => elem.RemoveAttribute(modification.attributeName),
         }
     }
 }

servo/components/script/dom/domtokenlist.rs

@@ -64,10 +64,7 @@ impl DOMTokenListMethods for DOMTokenList {
     // https://dom.spec.whatwg.org/#dom-domtokenlist-item
     fn Item(&self, index: u32) -> Option<DOMString> {
         self.attribute().and_then(|attr| {
-            let attr = attr.r();
-            Some(attr.value().as_tokens()).and_then(|tokens| {
-                tokens.get(index as usize).map(|token| (**token).to_owned())
-            })
+            attr.value().as_tokens().get(index as usize).map(|token| (**token).to_owned())
         })
     }