### 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/ui/views/frameless_view.cc
FramelessView::~FramelessView() = default;
void FramelessView::Init(NativeWindowViews* window, views::Widget* frame) {
  window_ = window;
  frame_ = frame;
}
int FramelessView::ResizingBorderHitTest(const gfx::Point& point) {
  
  
  bool can_ever_resize = frame_->widget_delegate()
                             ? frame_->widget_delegate()->CanResize()
                             : false;
  
  
  int resize_border = frame_->IsMaximized() || frame_->IsFullscreen()
                          ? 0
                          : kResizeInsideBoundsSize;
  return GetHTComponentForFrame(point, resize_border, resize_border,
                                kResizeAreaCornerSize, kResizeAreaCornerSize,
                                can_ever_resize);
}
gfx::Rect FramelessView::GetBoundsForClientView() const {