Revert of Mojo JS bindings: switch most usage of "connection"/"router" module to "bindings".

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';
 
 define('main', [
+    'mojo/public/js/connection',
     'chrome/browser/ui/webui/engagement/site_engagement.mojom',
     'content/public/renderer/frame_interfaces',
-], function(siteEngagementMojom, frameInterfaces) {
+], function(connection, siteEngagementMojom, frameInterfaces) {
   return function() {
-    var uiHandler = new siteEngagementMojom.SiteEngagementUIHandlerPtr(
+    var uiHandler = connection.bindHandleToProxy(
         frameInterfaces.getInterface(
-            siteEngagementMojom.SiteEngagementUIHandler.name));
+            siteEngagementMojom.SiteEngagementUIHandler.name),
+        siteEngagementMojom.SiteEngagementUIHandler);
 
     var engagementTableBody = $('engagement-table-body');
     var updateInterval = null;
     var info = null;
     var sortKey = 'score';
     var sortReverse = true;
 
     // Set table header sort handlers.
     var engagementTableHeader = $('engagement-table-header');
     var headers = engagementTableHeader.children;
@@ skipping 140 matching lines @@
       uiHandler.getSiteEngagementInfo().then(function(response) {
         info = response.info;
         renderTable(info);
       });
     };
 
     updateEngagementTable();
     enableAutoupdate();
   };
 });