### 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 new NativeWindowClientView(widget, root_view_.get(), this);
}
std::unique_ptr<views::NonClientFrameView>
NativeWindowViews::CreateNonClientFrameView(views::Widget* widget) {
#if defined(OS_WIN)
  auto frame_view = std::make_unique<WinFrameView>();
  frame_view->Init(this, widget);
  return frame_view;
#else
  if (has_frame()) {
    return std::make_unique<NativeFrameView>(this, widget);
  } else {
    auto frame_view = std::make_unique<FramelessView>();
    frame_view->Init(this, widget);
    return frame_view;
  }
#endif
}
void NativeWindowViews::OnWidgetMove() {