### Issue Details
in frameless windows 
While setting browserview style to draggable by webkit-app-region : drag. the area won't be draggable after that
and it can not move main window 
### Electron Version:
11.0.1
### Operating System:
Windows 10 (1803)
Last Known Working Electron version:
not found
### Expected Behavior
Browser view moves the main window while I set the style of the body or one of the area to
-webkit-app-region: drag;

### Actual Behavior
nothing happen in browserview after styling -webkit-app-region: drag;

I know it is mention that in 11 version it is fixed. but it still dosn't work 

### To Reproduce
https://gist.github.com/pejmanpesyan/8540aad65e7c6980c45f23e5eaafafb9

shell/browser/native_window_views.cc
widget()->CloseNow();
}
void NativeWindowViews::Focus(bool focus) {
  
  if (!IsVisible())
    return;
  if (focus) {
    widget()->Activate();
  } else {
    widget()->Deactivate();
  }
}
bool NativeWindowViews::IsFocused() {
  return widget()->IsActive();
}
void NativeWindowViews::Show() {
  if (is_modal() && NativeWindow::parent() &&
      !widget()->native_widget_private()->IsVisible())
    static_cast<NativeWindowViews*>(parent())->IncrementChildModals();
  widget()->native_widget_private()->Show(GetRestoredState(), gfx::Rect());
  
  widget()->Activate();
  NotifyWindowShow();
#if defined(USE_X11)
  if (!features::IsUsingOzonePlatform() && global_menu_bar_)
    global_menu_bar_->OnWindowMapped();
#endif
}
void NativeWindowViews::ShowInactive() {