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

### Issue Details

* **Electron Version:**
  * 6.0.0-beta.15
* **Operating System:**
  * Windows 10 64bit
* **Last Known Working Electron version:**
  * 5.0.8

### Expected Behavior
The window restores its size to what it used to be

### Actual Behavior
The window is shown in the smallest size

### To Reproduce
1) Maximize Window
2) Minimize Window
3) Restore Window (click on the icon in the taskbar)
4) Unmaximize Window

### Screenshots
![grafik](https://user-images.githubusercontent.com/10595986/61781949-84f18100-ae05-11e9-8983-17edb536427f.png)


shell/browser/native_window_views_win.cc
std::string command = AppCommandToString(command_id);
  NotifyWindowExecuteAppCommand(command);
  return false;
}
bool NativeWindowViews::PreHandleMSG(UINT message,
                                     WPARAM w_param,
                                     LPARAM l_param,
                                     LRESULT* result) {
  NotifyWindowMessage(message, w_param, l_param);
  switch (message) {
    
    
    
    
    
    case WM_GETOBJECT: {
      if (checked_for_a11y_support_)
        return false;
      const DWORD obj_id = static_cast<DWORD>(l_param);
      if (obj_id != static_cast<DWORD>(OBJID_CLIENT)) {
        return false;
      }
      if (!IsScreenReaderActive()) {
        return false;
      }
      checked_for_a11y_support_ = true;