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

parentNamespace,
    );
    precacheFiberNode(internalInstanceHandle, domElement);
    updateFiberProps(domElement, props);
    return domElement;
  },
  appendInitialChild(
    parentInstance: Instance,
    child: Instance | TextInstance,
  ): void {
    parentInstance.appendChild(child);
  },
  finalizeInitialChildren(
    domElement: Instance,
    type: string,
    props: Props,
    rootContainerInstance: Container,
  ): boolean {
    setInitialProperties(domElement, type, props, rootContainerInstance);
    return shouldAutoFocusHostComponent(type, props);
  },
  prepareUpdate(
    domElement: Instance,
    type: string,
    oldProps: Props,
    newProps: Props,
    rootContainerInstance: Container,
    hostContext: HostContext,
  ): null | Array<mixed> {
    if (__DEV__) {