Remove unused promiseRejectionIsError

Summary: Changelog: [Internal]

Reviewed By: MichaReiser

Differential Revision: D26338073

fbshipit-source-id: 7b4d8881ffc58ee93b1ccf58e6717a4a8597dece

Libraries/promiseRejectionIsError.js

@@ -1,24 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @format
- * @flow strict
- */
-
-'use strict';
-
-require('./Promise'); // make sure the default rejection handler is installed
-const rejectionTracking = require('promise/setimmediate/rejection-tracking');
-
-module.exports = () => {
-  rejectionTracking.enable({
-    allRejections: true,
-    onUnhandled: (id, error) => {
-      console.error(error);
-    },
-    onHandled: () => {},
-  });
-};