### 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
return is_enabled_ && (num_modal_children_ == 0);
}
void NativeWindowViews::SetEnabledInternal(bool enable) {
  if (enable && IsEnabled()) {
    return;
  } else if (!enable && !IsEnabled()) {
    return;
  }
#if defined(OS_WIN)
  ::EnableWindow(GetAcceleratedWidget(), enable);
#elif defined(USE_X11)
  if (!features::IsUsingOzonePlatform()) {
    views::DesktopWindowTreeHostPlatform* tree_host =
        views::DesktopWindowTreeHostLinux::GetHostForWidget(
            GetAcceleratedWidget());
    if (enable) {
      tree_host->RemoveEventRewriter(event_disabler_.get());
      event_disabler_.reset();
    } else {
      event_disabler_ = std::make_unique<EventDisabler>();
      tree_host->AddEventRewriter(event_disabler_.get());
    }
  }
#endif
}
#if defined(OS_LINUX)
void NativeWindowViews::Maximize() {