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

var ReactInputSelection = require('ReactInputSelection');
var ReactInstanceMap = require('ReactInstanceMap');
var ReactPortal = require('ReactPortal');
var ReactVersion = require('ReactVersion');
var {isValidElement} = require('react');
var {injectInternals} = require('ReactFiberDevToolsHook');
var {
  ELEMENT_NODE,
  TEXT_NODE,
  COMMENT_NODE,
  DOCUMENT_NODE,
  DOCUMENT_FRAGMENT_NODE,
} = require('HTMLNodeType');
var {ROOT_ATTRIBUTE_NAME} = require('DOMProperty');
var findDOMNode = require('findDOMNode');
var invariant = require('fbjs/lib/invariant');
var {
  createElement,
  getChildNamespace,
  setInitialProperties,
  diffProperties,
  updateProperties,
  diffHydratedProperties,
  diffHydratedText,
  warnForDeletedHydratableElement,
  warnForDeletedHydratableText,
  warnForInsertedHydratedElement,
  warnForInsertedHydratedText,
} = ReactDOMFiberComponent;
var {precacheFiberNode, updateFiberProps} = ReactDOMComponentTree;