Fix loss of mouse events when an Aura combobox is open in a modal dialog

ui/views/controls/combobox/native_combobox_views.cc

Index: ui/views/controls/combobox/native_combobox_views.cc
diff --git a/ui/views/controls/combobox/native_combobox_views.cc b/ui/views/controls/combobox/native_combobox_views.cc
index cb5e1ce8f7521f581467652f2bd5b33f99a2e5a5..aa8cbfafb2ee6e380a3c765781276ebf2324302e 100644
--- a/ui/views/controls/combobox/native_combobox_views.cc
+++ b/ui/views/controls/combobox/native_combobox_views.cc
@@ -361,7 +361,7 @@ void NativeComboboxViews::ShowDropDownMenu() {
 
   dropdown_open_ = true;
   if (dropdown_list_menu_runner_->RunMenuAt(
-          NULL, NULL, bounds, MenuItemView::TOPLEFT,
+          GetWidget(), NULL, bounds, MenuItemView::TOPLEFT,
           MenuRunner::HAS_MNEMONICS) == MenuRunner::MENU_DELETED)
     return;
   dropdown_open_ = false;