Remove some into_owned calls.

src/components/script/dom/characterdata.rs

@@ -98,7 +98,7 @@ impl<'a> CharacterDataMethods for JSRef<'a, CharacterData> {
         let mut data = self.data.deref().borrow().as_slice().slice(0, offset as uint).to_string();
         data.push_str(arg.as_slice());
         data.push_str(self.data.deref().borrow().as_slice().slice((offset + count) as uint, length as uint));
-        *self.data.deref().borrow_mut() = data.into_owned();
+        *self.data.deref().borrow_mut() = data;
         // FIXME: Once we have `Range`, we should implement step7 to step11
         Ok(())
     }

src/components/script/dom/htmlcollection.rs

@@ -103,7 +103,7 @@ impl HTMLCollection {
             }
         }
         let filter = ClassNameFilter {
-            classes: split_html_space_chars(classes.as_slice()).map(|class| class.into_owned()).collect()
+            classes: split_html_space_chars(classes.as_slice()).map(|class| class.to_string()).collect()
         };
         HTMLCollection::create(window, root, box filter)
     }

src/components/script/dom/htmlserializer.rs

@@ -62,7 +62,7 @@ pub fn serialize(iterator: &mut NodeIterator) -> String {
         html.push_str(open_elements.pop().unwrap().as_slice());
         html.push_str(">");
     }
-    html.into_owned()
+    html
 }
 
 fn serialize_comment(comment: &JSRef<Comment>, html: &mut String) {

src/components/script/dom/node.rs

@@ -1539,7 +1539,7 @@ impl<'a> NodeMethods for JSRef<'a, Node> {
                         content.push_str(text.deref().characterdata.data.deref().borrow().as_slice());
                     }
                 }
-                Some(content.into_owned())
+                Some(content)
             }
             CommentNodeTypeId |
             TextNodeTypeId |