style: remove not use file

components/_util/createChainedFunction.js

@@ -1,22 +0,0 @@
-/**
- * Safe chained function
- *
- * Will only create a new function if needed,
- * otherwise will pass back existing functions or null.
- *
- * @returns {function|null}
- */
-export default function createChainedFunction() {
-  const args = [].slice.call(arguments, 0);
-  if (args.length === 1) {
-    return args[0];
-  }
-
-  return function chainedFunction() {
-    for (let i = 0; i < args.length; i++) {
-      if (args[i] && args[i].apply) {
-        args[i].apply(this, arguments);
-      }
-    }
-  };
-}

components/_util/isFlexSupported.js

@@ -1,12 +0,0 @@
-export default function isFlexSupported() {
-  if (typeof window !== 'undefined' && window.document && window.document.documentElement) {
-    const { documentElement } = window.document;
-    return (
-      'flex' in documentElement.style ||
-      'webkitFlex' in documentElement.style ||
-      'Flex' in documentElement.style ||
-      'msFlex' in documentElement.style
-    );
-  }
-  return false;
-}