views: Fix crash in NativeMenuWin::AddMenuItemAt().

BUG=233243
R=msw@chromium.org
TBR=ben@chromium.org

Review URL: https://codereview.chromium.org/14267007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195033 0039d316-1c4b-4281-b951-d872f2087c98

ui/views/controls/menu/native_menu_win.cc

@@ -627,7 +627,8 @@ void NativeMenuWin::AddMenuItemAt(int menu_index, int model_index) {
   ui::MenuModel::ItemType type = model_->GetTypeAt(model_index);
   if (type == ui::MenuModel::TYPE_SUBMENU) {
     item_data->submenu.reset(
-        new NativeMenuWin(model_->GetSubmenuModelAt(model_index), NULL));
+        new NativeMenuWin(model_->GetSubmenuModelAt(model_index),
+                          system_menu_for_));
     mii.fMask |= MIIM_SUBMENU;
     mii.hSubMenu = item_data->submenu->GetNativeMenu();
     GetNativeMenuWinFromHMENU(mii.hSubMenu)->parent_ = this;