Backed out changeset 00074091644d (bug 1519095) for browser-chrome failures at browser/base/content/test/popups/browser_popup_blocker.js

toolkit/content/widgets/notificationbox.js

@@ -337,14 +337,6 @@ MozElements.Notification = class Notification extends MozXULElement {
     return this.closest(".notificationbox-stack")._notificationBox;
   }
 
-  /**
-   * Changes the text of an existing notification. If the notification was
-   * created with a custom fragment, it will be overwritten with plain text.
-   */
-  set label(value) {
-    this.messageText.textContent = value;
-  }
-
   /**
    * This method should only be called when the user has manually closed the
    * notification. If you want to programmatically close the notification, you