Bug 1704936 - Make browser/components/places/tests/browser/browser_bookmarks_toolbar_telemetry.js work with native context menus r=mac-reviewers,bradwerth

Differential Revision: https://phabricator.services.mozilla.com/D111937

browser/components/places/tests/browser/browser_bookmarks_toolbar_telemetry.js

@@ -133,12 +133,12 @@ async function changeToolbarVisibilityViaContextMenu(nextState) {
   let bookmarksToolbarMenu = document.querySelector("#toggle_PersonalToolbar");
   let subMenu = bookmarksToolbarMenu.querySelector("menupopup");
   popupShown = BrowserTestUtils.waitForEvent(subMenu, "popupshown");
-  EventUtils.synthesizeMouseAtCenter(bookmarksToolbarMenu, {});
+  bookmarksToolbarMenu.openMenu(true);
   await popupShown;
   let menuItem = document.querySelector(
     `menuitem[data-visibility-enum="${nextState}"]`
   );
-  EventUtils.synthesizeMouseAtCenter(menuItem, {});
+  subMenu.activateItem(menuItem);
   contextMenu.hidePopup();
 }