refactor: don't expose NavigationController as an internal module (#15920)

lib/browser/api/module-list.js

@@ -30,9 +30,7 @@ module.exports = [
   { name: 'Tray', file: 'tray' },
   { name: 'View', file: 'view' },
   { name: 'webContents', file: 'web-contents' },
-  { name: 'WebContentsView', file: 'web-contents-view' },
-  // The internal modules, invisible unless you know their names.
-  { name: 'NavigationController', file: 'navigation-controller', private: true }
+  { name: 'WebContentsView', file: 'web-contents-view' }
 ]
 
 if (features.isViewApiEnabled()) {

lib/browser/api/web-contents.js

@@ -5,8 +5,9 @@ const { EventEmitter } = require('events')
 const electron = require('electron')
 const path = require('path')
 const url = require('url')
-const { app, ipcMain, session, NavigationController, deprecate } = electron
+const { app, ipcMain, session, deprecate } = electron
 
+const NavigationController = require('@electron/internal/browser/navigation-controller')
 const ipcMainInternal = require('@electron/internal/browser/ipc-main-internal')
 const errorUtils = require('@electron/internal/common/error-utils')