remove flow check in electron app.js (#26184)

When we were upgrading flow in
6ddcbd4
we added `$FlowFixMe` for some parameters in this file. However, this
file is not compiled at all, and the `:` syntax breaks the code.

This PR removes the flow check in this file

packages/react-devtools/app.js

@@ -3,8 +3,6 @@
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
- *
- * @flow
  */
 
 const {app, BrowserWindow} = require('electron'); // Module to create native browser window.
@@ -40,17 +38,12 @@ app.on('ready', function () {
  }
 
  // https://stackoverflow.com/questions/32402327/
- // $FlowFixMe[incompatible-use] found when upgrading Flow
- mainWindow.webContents.on(
- 'new-window',
- function (event: $FlowFixMe, url: $FlowFixMe) {
- event.preventDefault();
- require('electron').shell.openExternal(url);
- },
- );
+ mainWindow.webContents.on('new-window', function (event, url) {
+ event.preventDefault();
+ require('electron').shell.openExternal(url);
+ });
 
  // and load the index.html of the app.
- // $FlowFixMe[incompatible-use] found when upgrading Flow
  mainWindow.loadURL('file://' + __dirname + '/app.html'); // eslint-disable-line no-path-concat
  // $FlowFixMe[incompatible-use] found when upgrading Flow
  mainWindow.webContents.executeJavaScript(
@@ -61,7 +54,6 @@ app.on('ready', function () {
  );
 
  // Emitted when the window is closed.
- // $FlowFixMe[incompatible-use] found when upgrading Flow
  mainWindow.on('closed', function () {
  mainWindow = null;
  });