Move enum MenuAnchorPosition to reduce deps on menu_item_view.h

ui/app_list/views/app_list_menu_views.cc

Index: ui/app_list/views/app_list_menu_views.cc
diff --git a/ui/app_list/views/app_list_menu_views.cc b/ui/app_list/views/app_list_menu_views.cc
index ee3e3e85cc033906aa9ab1fe9955c8ce2a15c15e..c806935e837257228b562917e617eb279a3970d8 100644
--- a/ui/app_list/views/app_list_menu_views.cc
+++ b/ui/app_list/views/app_list_menu_views.cc
@@ -31,10 +31,12 @@ AppListMenuViews::~AppListMenuViews() {}
 
 void AppListMenuViews::RunMenuAt(views::MenuButton* button,
                                  const gfx::Point& point) {
-  ignore_result(menu_runner_->RunMenuAt(button->GetWidget(), button,
+  ignore_result(menu_runner_->RunMenuAt(button->GetWidget(),
+                                        button,
                                         gfx::Rect(point, gfx::Size()),
-                                        MenuItemView::TOPRIGHT,
-                                        ui::MENU_SOURCE_NONE, 0));
+                                        ui::MENU_ANCHOR_TOPRIGHT,
+                                        ui::MENU_SOURCE_NONE,
+                                        0));
 }
 
 void AppListMenuViews::Cancel() {