Remove baseForOwn from several modules.

functions.js

@@ -1,6 +1,3 @@
-import arrayFilter from './arrayFilter.js'
-import keys from './keys.js'
-
 /**
  * Creates an array of function property names from own enumerable properties
  * of `object`.
@@ -23,9 +20,10 @@ import keys from './keys.js'
  * // => ['a', 'b']
  */
 function functions(object) {
-  return object == null
-    ? []
-    : arrayFilter(keys(object), key => typeof object[key] == 'function')
+  if (object == null) {
+    return []
+  }
+  return Object.keys(object).filter((key) => typeof object[key] == 'function')
 }
 
 export default functions