### 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
}
  gfx::Insets insets;
  if (!has_frame()) {
    
    
    
    
    
    
    
    float scale_factor =
        display::win::ScreenWin::GetScaleFactorForHWND(GetAcceleratedWidget());
    int thickness = std::ceil(kAutoHideTaskbarThicknessPx / scale_factor);
    if (autohide_edges & AppbarAutohideEdge::LEFT)
      insets.set_left(-thickness);
    if (autohide_edges & AppbarAutohideEdge::TOP)
      insets.set_top(-thickness);
    if (autohide_edges & AppbarAutohideEdge::RIGHT)
      insets.set_right(thickness);
    if (autohide_edges & AppbarAutohideEdge::BOTTOM)
      insets.set_bottom(thickness);
  }
  restore_bounds_ = GetBounds();
  auto display =
      display::Screen::GetScreen()->GetDisplayNearestPoint(GetPosition());
  gfx::Rect bounds = display.work_area();
  bounds.Inset(insets);
  SetBounds(bounds, false);
}
bool NativeWindowViews::ExecuteWindowsCommand(int command_id) {