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

if (__DEV__) {
  var lowPriorityWarning = require('lowPriorityWarning');
  var warning = require('fbjs/lib/warning');
  var validateDOMNesting = require('validateDOMNesting');
  var {updatedAncestorInfo} = validateDOMNesting;
  if (
    typeof Map !== 'function' ||
    Map.prototype == null ||
    typeof Map.prototype.forEach !== 'function' ||
    typeof Set !== 'function' ||
    Set.prototype == null ||
    typeof Set.prototype.clear !== 'function' ||
    typeof Set.prototype.forEach !== 'function'
  ) {
    warning(
      false,
      'React depends on Map and Set built-in types. Make sure that you load a ' +
        'polyfill in older browsers. http://fb.me/react-polyfills',
    );
  }
}
require('ReactDOMClientInjection');
require('ReactDOMInjection');
ReactControlledComponent.injection.injectFiberControlledHostComponent(
  ReactDOMFiberComponent,
);
findDOMNode._injectFiber(function(fiber: Fiber) {
  return DOMRenderer.findHostInstance(fiber);
});
type DOMContainer =