### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
- [X] I have searched the [issue tracker](https://www.github.com/electron/electron/issues) for a feature request that matches the one I want to file, without success.

### Electron Version

12.0.5

### What operating system are you using?

macOS

### Operating System Version

11.2.3

### What arch are you using?

arm64 (including Apple Silicon)

### Last Known Working Electron version

_No response_

### Expected Behavior

`document.hasFocus()` is only `true` for the window that has focus.

### Actual Behavior

Ever window reports `document.hasFocus()` to be `true` right after opening.

### Testcase Gist URL

https://gist.github.com/16e6fc829febd0cab115dfd0850a31be

### Additional Information

_No response_
shell/browser/api/electron_api_web_contents.cc
if (source && source->GetOutermostWebContents() == source) {
     If this is the outermost web contents and the user has tabbed or
     shift + tabbed through all the elements, reset the focus back to
     the first or last element so that it doesn't stay in the body.
    source->FocusThroughTabTraversal(reverse);
    return true;
  }
  return false;
}
content::PictureInPictureResult WebContents::EnterPictureInPicture(
    content::WebContents* ontents,
    const viz::SurfaceId& surface_id,
    const gfx::Size& natural_size) {
#if BUILDFLAG(ENABLE_PICTURE_IN_PICTURE)
  return PictureInPictureWindowManager::GetInstance()->EnterPictureInPicture(
      ontents, surface_id, natural_size);
#else
  return content::PictureInPictureResult::kNotSupported;
#endif
}
void WebContents::ExitPictureInPicture() {
#if BUILDFLAG(ENABLE_PICTURE_IN_PICTURE)
  PictureInPictureWindowManager::GetInstance()->ExitPictureInPicture();
#endif
}
void WebContents::DevToolsSaveToFile(const std::string& url,