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, 4 insertions, 4 deletions

diff --git a/src/components/script/dom/htmlframesetelement.rs b/src/components/script/dom/htmlframesetelement.rs
index beb7021ffb6..6a4551370d9 100644
--- a/src/components/script/dom/htmlframesetelement.rs
+++ b/src/components/script/dom/htmlframesetelement.rs
@@ -39,9 +39,9 @@ impl HTMLFrameSetElement {
 
 pub trait HTMLFrameSetElementMethods {
     fn Cols(&self) -> DOMString;
-    fn SetCols(&mut self, _cols: DOMString) -> ErrorResult;
+    fn SetCols(&self, _cols: DOMString) -> ErrorResult;
     fn Rows(&self) -> DOMString;
-    fn SetRows(&mut self, _rows: DOMString) -> ErrorResult;
+    fn SetRows(&self, _rows: DOMString) -> ErrorResult;
 }
 
 impl<'a> HTMLFrameSetElementMethods for JSRef<'a, HTMLFrameSetElement> {
@@ -49,7 +49,7 @@ impl<'a> HTMLFrameSetElementMethods for JSRef<'a, HTMLFrameSetElement> {
         "".to_owned()
     }
 
-    fn SetCols(&mut self, _cols: DOMString) -> ErrorResult {
+    fn SetCols(&self, _cols: DOMString) -> ErrorResult {
         Ok(())
     }
 
@@ -57,7 +57,7 @@ impl<'a> HTMLFrameSetElementMethods for JSRef<'a, HTMLFrameSetElement> {
         "".to_owned()
     }
 
-    fn SetRows(&mut self, _rows: DOMString) -> ErrorResult {
+    fn SetRows(&self, _rows: DOMString) -> ErrorResult {
         Ok(())
     }
 }