Revert "fix: Promise.prototype.finally is object (#16620)" (#16753)

This reverts commit 6926ab7.

Author: ijjk

packages/next/client/index.tsx

@@ -21,8 +21,6 @@ import PageLoader, { looseToArray, StyleSheetTuple } from './page-loader'
 import measureWebVitals from './performance-relayer'
 import { createRouter, makePublicRouterInstance } from './router'
 
-require('next/dist/build/polyfills/finally-polyfill.min')
-
 /// <reference types="react-dom/experimental" />
 
 declare let __webpack_public_path__: string
@@ -43,6 +41,10 @@ declare global {
 type RenderRouteInfo = PrivateRouteInfo & { App: AppComponent }
 type RenderErrorProps = Omit<RenderRouteInfo, 'Component' | 'styleSheets'>
 
+if (!('finally' in Promise.prototype)) {
+  ;(Promise.prototype as PromiseConstructor['prototype']).finally = require('next/dist/build/polyfills/finally-polyfill.min')
+}
+
 const data: typeof window['__NEXT_DATA__'] = JSON.parse(
   document.getElementById('__NEXT_DATA__')!.textContent!
 )

packages/next/package.json

@@ -181,7 +181,7 @@
     "escape-string-regexp": "2.0.0",
     "etag": "1.8.1",
     "file-loader": "6.0.0",
-    "finally-polyfill": "0.2.0",
+    "finally-polyfill": "0.1.0",
     "find-up": "4.1.0",
     "fresh": "0.5.2",
     "gzip-size": "5.1.1",