auto merge of #2520 : saneyuki/servo/mut, r=Ms2ger

Related #2514

- This removes needless `&mut self`s from some DOM type method simply.
- This doesn't include some DOM Types which have basis method called from other types (e.g. `Element`). We still have to need to open their changes.
- This does not include to remove an implicit `deref_mut()`.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/components/script/dom/htmllegendelement.rs b/src/components/script/dom/htmllegendelement.rs
index e2e7d49f905..85bbb4deae7 100644
--- a/src/components/script/dom/htmllegendelement.rs
+++ b/src/components/script/dom/htmllegendelement.rs
@@ -39,7 +39,7 @@ impl HTMLLegendElement {
 
 pub trait HTMLLegendElementMethods {
     fn Align(&self) -> DOMString;
-    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult;
+    fn SetAlign(&self, _align: DOMString) -> ErrorResult;
 }
 
 impl<'a> HTMLLegendElementMethods for JSRef<'a, HTMLLegendElement> {
@@ -47,7 +47,7 @@ impl<'a> HTMLLegendElementMethods for JSRef<'a, HTMLLegendElement> {
         "".to_owned()
     }
 
-    fn SetAlign(&mut self, _align: DOMString) -> ErrorResult {
+    fn SetAlign(&self, _align: DOMString) -> ErrorResult {
         Ok(())
     }
 }