This is a bug report.

**Expected Behavior**
React should not suggest me to download the DevTools extension in a `chrome-extension://` page, because the extension has no permission to inject the devtool.

**Actual Behavior**
`Download the React DevTools and use an HTTP server (instead of a file: URL) for a better development experience: https://fb.me/react-devtools`

**Reproducing**

1. Create a Chrome extension with an `option` or `popup` page that uses React
2. Load the extension to Chrome and open up that page.
3. Observe console.

**Version**
Google Chrome 56.0.2924.3
React 15.4.0

/**
 * Copyright 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule ReactDOMFiberEntry
 * @flow
 */
'use strict';
import type {Fiber} from 'ReactFiber';
import type {ReactNodeList} from 'ReactTypes';
var ExecutionEnvironment = require('fbjs/lib/ExecutionEnvironment');
var ReactBrowserEventEmitter = require('ReactBrowserEventEmitter');
var ReactControlledComponent = require('ReactControlledComponent');
var ReactDOMComponentTree = require('ReactDOMComponentTree');
var ReactFeatureFlags = require('ReactFeatureFlags');
var ReactDOMFeatureFlags = require('ReactDOMFeatureFlags');
var ReactDOMFiberComponent = require('ReactDOMFiberComponent');
var ReactDOMFrameScheduling = require('ReactDOMFrameScheduling');
var ReactGenericBatching = require('ReactGenericBatching');
var ReactFiberReconciler = require('ReactFiberReconciler');