### 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

12.0.7

### What operating system are you using?

Ubuntu

### Operating System Version

5.4.0-73-generic #82~18.04.1-Ubuntu

### What arch are you using?

x64

### Last Known Working Electron version

_No response_

### Expected Behavior

`const existingPermissions = await navigator.serial.getPorts();` should return a list of serial ports for which permission has already been granted, even when a device has been unplugged and plugged back in again.

### Actual Behavior

The list is empty, even when the same code works in the browser (Chromium v90.0.4430.93).

### Testcase Gist URL

https://gist.github.com/gniezen/34950a5fa84dcf000e2b55a8d599ecd6

### Additional Information

To reproduce using gist:

- Replace `usbVendorId` and `usbProductId` with that of your test device.
- Click the `Connect` button. It should show up in the port list on the main console.
- Click the `Get Ports` button. It should show the existing permission in the developer console.
- Unplug and re-plug the device.
- Click the `Get Ports` button. It should show the existing permissions, but returns an empty list.
shell/browser/serial/serial_chooser_context.h
void RemovePortObserver(PortObserver* observer);
  base::WeakPtr<SerialChooserContext> AsWeakPtr();
  
  void OnPortAdded(device::mojom::SerialPortInfoPtr port) override;
  void OnPortRemoved(device::mojom::SerialPortInfoPtr port) override;
 private:
  void EnsurePortManagerConnection();
  void SetUpPortManagerConnection(
      mojo::PendingRemote<device::mojom::SerialPortManager> manager);
  void OnPortManagerConnectionError();
  void OnGetPorts(const url::Origin& requesting_origin,
                  const url::Origin& embedding_origin,
                  blink::mojom::SerialService::GetPortsCallback callback,
                  std::vector<device::mojom::SerialPortInfoPtr> ports);
  
  
  std::map<std::pair<url::Origin, url::Origin>,
           std::set<base::UnguessableToken>>
      ephemeral_ports_;
  
  std::map<base::UnguessableToken, base::Value> port_info_;
  mojo::Remote<device::mojom::SerialPortManager> port_manager_;
  mojo::Receiver<device::mojom::SerialPortManagerClient> client_receiver_{this};
  base::ObserverList<PortObserver> port_observer_list_;
  base::WeakPtrFactory<SerialChooserContext> weak_factory_{this};
  DISALLOW_COPY_AND_ASSIGN(SerialChooserContext);
};
}  
#endif