### 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/native_window.h
: public content::WebContentsUserData<NativeWindowRelay> {
 public:
  static void CreateForWebContents(content::WebContents*,
                                   base::WeakPtr<NativeWindow>);
  ~NativeWindowRelay() override;
  NativeWindow* GetNativeWindow() const { return native_window_.get(); }
  WEB_CONTENTS_USER_DATA_KEY_DECL();
 private:
  friend class content::WebContentsUserData<NativeWindow>;
  explicit NativeWindowRelay(base::WeakPtr<NativeWindow> window);
  base::WeakPtr<NativeWindow> native_window_;
};
}  
#endif