Removing unused code

src/js/utils/easing.js

@@ -7,13 +7,4 @@ function swing(p) {
   return 0.5 - Math.cos(p * Math.PI) / 2;
 }
 
-/**
- * Linear easing function.
- * @param {number} p The percentage of time that has passed.
- * @return {number}
- */
-function linear(p) {
-  return p;
-}
-
-export default {swing, linear};
+export default {swing};