### 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_browser_view_views.cc
auto new_view_size = view->size();
    new_view_size.set_width(new_view_size.width() + width_delta);
    new_view_size.set_height(new_view_size.height() + height_delta);
    view->SetSize(new_view_size);
  }
  auto new_view_bounds = view->bounds();
  if (flags & kAutoResizeHorizontal) {
    new_view_bounds.set_width(new_window.width() /
                              auto_horizontal_proportion_width_);
    new_view_bounds.set_x(new_window.width() /
                          auto_horizontal_proportion_left_);
  }
  if (flags & kAutoResizeVertical) {
    new_view_bounds.set_height(new_window.height() /
                               auto_vertical_proportion_height_);
    new_view_bounds.set_y(new_window.height() / auto_vertical_proportion_top_);
  }
  if ((flags & kAutoResizeHorizontal) || (flags & kAutoResizeVertical)) {
    view->SetBoundsRect(new_view_bounds);
  }
}
void NativeBrowserViewViews::ResetAutoResizeProportions() {
  if (auto_resize_flags_ & AutoResizeFlags::kAutoResizeHorizontal) {
    auto_horizontal_proportion_set_ = false;
  }
  if (auto_resize_flags_ & AutoResizeFlags::kAutoResizeVertical) {
    auto_vertical_proportion_set_ = false;
  }
}
void NativeBrowserViewViews::SetBounds(const gfx::Rect& bounds) {