CRM 2016: Social Pane Hide Add Phone Call or Add Task link

function Form_OnLoad()
{
    setTimeout(function () {
        var crmContentPnl = parent.parent.document.getElementById("crmContentPanel");
        for (k = 0; k < crmContentPnl.children.length; k++)
        {
            if (crmContentPnl.children[k].style.visibility == "visible" && crmContentPnl.children[k].tagName.toLowerCase() == "iframe")
            {
                var notesControl = crmContentPnl.children[k].contentWindow.document.getElementById("notescontrolactivityContainer_notescontrol");
                // phone call
                notesControl.children[0].children[1].children[0].style.display = "none"; return false;');
                // task
                notesControl.children[0].children[1].children[1].style.display = "none"; return false;');
                break;
            }
        }
     },5000);
}