servo: Merge #8287 - Fix unused variable warnings (from eefriedman:label-unused-var); r=Manishearth

Source-Repo: https://github.com/servo/servo
Source-Revision: 1add1185ab338709082981f226e8227cabfac866

servo/components/script/dom/htmllabelelement.rs

@@ -69,7 +69,7 @@ impl Activatable for HTMLLabelElement {
     }
 
     // https://html.spec.whatwg.org/multipage/#implicit-submission
-    fn implicit_submission(&self, ctrlKey: bool, shiftKey: bool, altKey: bool, metaKey: bool) {
+    fn implicit_submission(&self, _ctrlKey: bool, _shiftKey: bool, _altKey: bool, _metaKey: bool) {
         //FIXME: Investigate and implement implicit submission for label elements
         // Issue filed at https://github.com/servo/servo/issues/8263
     }