Fixup for https://phabricator.services.mozilla.com/D261581

Signed-off-by: Oriol Brufau <obrufau@igalia.com>

Author: Loirooriol

style/matching.rs

@@ -691,7 +691,7 @@ trait PrivateMatchMethods: TElement {
         new_values: &Arc<ComputedValues>,
         pseudo_element: Option<PseudoElement>,
     ) -> bool {
-        use crate::animation::{self, AnimationSetKey, AnimationState};
+        use crate::animation::{AnimationSetKey, AnimationState};
 
         // We need to call this before accessing the `ElementAnimationSet` from the
         // map because this call will do a RwLock::read().