### Preflight Checklist
<!-- Please ensure you've completed the following steps by replacing [ ] with [x]-->

* [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 for an issue that matches the one I want to file, without success.

### Issue Details

* **Electron Version:**
  * 8.0.0
* **Operating System:**
  * Windows 10 Pro (1709)

### Expected Behavior
Using Notification API in main process with `timeoutType: 'never` I expected that the notification disappears only when the user clicks on it.  

### Actual Behavior
After few seconds the notification disappers.

### To Reproduce

```
  const newNotification = new Notification({title: 'I am a main process Notification!', timeoutType: 'never'})
  newNotification.show()
```

```sh
$ git clone https://github.com/p-fusi/electron-quick-start -b master
$ npm install
$ npm run start
```


shell/browser/notifications/win/windows_toast_notification.cc
const wchar_t* xmlString,
    IXmlDocument** doc) {
  ComPtr<IXmlDocument> xmlDoc;
  RETURN_IF_FAILED(Windows::Foundation::ActivateInstance(
      HStringReference(RuntimeClass_Windows_Data_Xml_Dom_XmlDocument).Get(),
      &xmlDoc));
  ComPtr<IXmlDocumentIO> docIO;
  RETURN_IF_FAILED(xmlDoc.As(&docIO));
  RETURN_IF_FAILED(docIO->LoadXml(HStringReference(xmlString).Get()));
  return xmlDoc.CopyTo(doc);
}
HRESULT WindowsToastNotification::SetupCallbacks(
    ABI::Windows::UI::Notifications::IToastNotification* toast) {
  event_handler_ = Make<ToastEventHandler>(this);
  RETURN_IF_FAILED(
      toast->add_Activated(event_handler_.Get(), &activated_token_));
  RETURN_IF_FAILED(
      toast->add_Dismissed(event_handler_.Get(), &dismissed_token_));
  RETURN_IF_FAILED(toast->add_Failed(event_handler_.Get(), &failed_token_));
  return S_OK;
}
bool WindowsToastNotification::RemoveCallbacks(