length not length()

Change-Id: Ie87a7ed7a9adc4c8e593b610bc4a9eefc61fbf85
diff --git a/src/main/resources/static/chromium-behavior.html b/src/main/resources/static/chromium-behavior.html
index d20da6a..12cf075 100644
--- a/src/main/resources/static/chromium-behavior.html
+++ b/src/main/resources/static/chromium-behavior.html
@@ -851,8 +851,7 @@
               (!announcementCookieExists(ann.id))));
             const messages = shownAnnouncements.map(ann => ann.messageContent);
             message.textContent = messages.join('\r\n');
-            closeBtn.style.visibility = messages.length() ?
-                'visible' : 'hidden';
+            closeBtn.style.visibility = messages.length ? 'visible' : 'hidden';
           }).catch((e) => {
             console.log(e);
             message.textContent = 'Unable to get outage announcements from ChOpsDash.';