public void cancel(String platformTag, int platformId) throws RemoteException {
        Bundle args = new CancelNotificationArgs(platformTag, platformId).toBundle();
        mService.cancelNotification(args);
    }
Requests a notification be cancelled.
@param platformTag The tag to identify the notification.
@param platformId The id to identify the notification.
@throws RemoteException If the Service dies while responding to the request.
@throws SecurityException If verification with the TrustedWebActivityService fails.
customtabs/src/android/support/customtabs/trusted/TrustedWebActivityServiceWrapper.java