RN: Remove DebugEnvironment from OSS

Reviewed By: TheSavior

Differential Revision: D7209266

fbshipit-source-id: 9f9ce66121ff375e5a5d965d58f4137616407853

Libraries/Utilities/DebugEnvironment.js

@@ -1,16 +0,0 @@
-/**
- * Copyright (c) 2013-present, Facebook, Inc.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @providesModule DebugEnvironment
- * @flow
- */
-
-'use strict';
-
-module.exports = {
-  // When crippled, synchronous JS function calls to native will fail.
-  isCrippledMode: __DEV__ && !global.nativeCallSyncHook,
-};