### 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 widget()->IsFullscreen();
}
void NativeWindowViews::SetBounds(const gfx::Rect& bounds, bool animate) {
#if defined(OS_WIN) || defined(OS_LINUX)
  
  
  if (!resizable_) {
    SetMaximumSize(bounds.size());
    SetMinimumSize(bounds.size());
  }
#endif
  widget()->SetBounds(bounds);
}
gfx::Rect NativeWindowViews::GetBounds() {
#if defined(OS_WIN)
  if (IsMinimized())
    return widget()->GetRestoredBounds();
#endif
  return widget()->GetWindowBoundsInScreen();
}
gfx::Rect NativeWindowViews::GetContentBounds() {