WebUI: Fix more violations of no-extra-semi lint rule.

chrome/browser/resources/engagement/site_engagement.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 'use strict';
 
 // Allow a function to be provided by tests, which will be called when
 // the page has been populated with site engagement details.
 var resolvePageIsPopulated = null;
 var pageIsPopulatedPromise = new Promise((resolve, reject) => {
@@ skipping 189 matching lines @@
     /**
      * Retrieve site engagement info and render the engagement table.
      */
     function updateEngagementTable() {
       // Populate engagement table.
       uiHandler.getSiteEngagementDetails().then((response) => {
         info = response.info;
         renderTable(info);
         resolvePageIsPopulated();
       });
-    };
+    }
 
     updateEngagementTable();
     enableAutoupdate();
   };
 });