### 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
auto* const axState = content::BrowserAccessibilityState::GetInstance();
      if (axState && !axState->IsAccessibleBrowser()) {
        axState->OnScreenReaderDetected();
        Browser::Get()->OnAccessibilitySupportChanged();
      }
      return false;
    }
    case WM_GETMINMAXINFO: {
      WINDOWPLACEMENT wp;
      wp.length = sizeof(WINDOWPLACEMENT);
      
      
      
      
      
      if (!last_normal_placement_bounds_.IsEmpty() &&
          GetWindowPlacement(GetAcceleratedWidget(), &wp)) {
        last_normal_placement_bounds_.set_size(gfx::Size(0, 0));
        wp.rcNormalPosition = last_normal_placement_bounds_.ToRECT();
        SetWindowPlacement(GetAcceleratedWidget(), &wp);
        last_normal_placement_bounds_ = gfx::Rect();
      }
      return false;
    }
    case WM_NCCALCSIZE: {
      if (!has_frame() && w_param == TRUE) {
        NCCALCSIZE_PARAMS* params =
            reinterpret_cast<NCCALCSIZE_PARAMS*>(l_param);
        RECT PROPOSED = params->rgrc[0];
        RECT BEFORE = params->rgrc[1];