refactor: remove duplicate change event listener override (#7903)

packages/field-base/src/input-control-mixin.js

@@ -128,30 +128,6 @@ export const InputControlMixin = (superclass) =>
  }
  }
 
- /**
- * Override an event listener inherited from `InputMixin`
- * to capture native `change` event and make sure that
- * a new one is dispatched after validation runs.
- * @param {Event} event
- * @protected
- * @override
- */
- _onChange(event) {
- event.stopPropagation();
-
- this.validate();
-
- this.dispatchEvent(
- new CustomEvent('change', {
- detail: {
- sourceEvent: event,
- },
- bubbles: event.bubbles,
- cancelable: event.cancelable,
- }),
- );
- }
-
  /**
  * Override a method from `InputMixin`.
  * @param {!HTMLElement} input