Remove the now-unnecessary setTimeout when presenting a hover menu. The asynchronous setting of the WebInspector.HoverMenu.VisibleClassName would introduce some issues where we could get remnant hover menus on screen due to dismiss() being called prior to the WebInspector.HoverMenu.VisibleClassName class being set on the element in the setTimeout() call and the call to this._element.remove() thus failing in the "transitionend" event handler.