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/htmltableelement.rs b/src/components/script/dom/htmltableelement.rs
index d675ddcad04..20fd1d1e964 100644
--- a/src/components/script/dom/htmltableelement.rs
+++ b/src/components/script/dom/htmltableelement.rs
@@ -41,7 +41,7 @@ pub trait HTMLTableElementMethods {
     fn DeleteCaption(&self);
     fn DeleteTHead(&self);
     fn DeleteTFoot(&self);
-    fn DeleteRow(&mut self, _index: i32) -> ErrorResult;
+    fn DeleteRow(&self, _index: i32) -> ErrorResult;
     fn Sortable(&self) -> bool;
     fn SetSortable(&self, _sortable: bool);
     fn StopSorting(&self);
@@ -75,7 +75,7 @@ impl<'a> HTMLTableElementMethods for JSRef<'a, HTMLTableElement> {
     fn DeleteTFoot(&self) {
     }
 
-    fn DeleteRow(&mut self, _index: i32) -> ErrorResult {
+    fn DeleteRow(&self, _index: i32) -> ErrorResult {
         Ok(())
     }