### 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
NotificationDelegate* delegate,
    NotificationPresenter* presenter)
    : Notification(delegate, presenter) {}
WindowsToastNotification::~WindowsToastNotification() {
  
  if (toast_notification_) {
    RemoveCallbacks(toast_notification_.Get());
  }
}
void WindowsToastNotification::Show(const NotificationOptions& options) {
  if (SUCCEEDED(ShowInternal(options))) {
    if (IsDebuggingNotifications())
      LOG(INFO) << "Notification created";
    if (delegate())
      delegate()->NotificationDisplayed();
  }
}
void WindowsToastNotification::Dismiss() {
  if (IsDebuggingNotifications())
    LOG(INFO) << "Hiding notification";
  toast_notifier_->Hide(toast_notification_.Get());
}
HRESULT WindowsToastNotification::ShowInternal(
    const NotificationOptions& options) {
  ComPtr<IXmlDocument> toast_xml;
  
  if (!options.toast_xml.empty()) {
    REPORT_AND_RETURN_IF_FAILED(
        XmlDocumentFromString(options.toast_xml.c_str(), &toast_xml),
        "XML: Invalid XML");