[Sync] Update Type Info section of sync-internals.

components/sync/driver/resources/about.js

 // Copyright (c) 2012 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.
 
 cr.define('chrome.sync.about_tab', function() {
   // Contains the latest snapshot of sync about info.
   chrome.sync.aboutInfo = {};
 
   function highlightIfChanged(node, oldVal, newVal) {
     function clearHighlight() {
@@ skipping 25 matching lines @@
     var details = e.details;
 
     var modelType = details.modelType;
     var counters = details.counters;
 
     var type_status_array = chrome.sync.aboutInfo.type_status;
     type_status_array.forEach(function(row) {
       if (row.name == modelType) {
         // There are three types of counters, only "status" counters have these
         // fields. Keep the old values if updated fields are not present.
-        if (counters.numEntriesAndTombstones) {
+        if (counters.numEntriesAndTombstones !== undefined) {
           row.num_entries = counters.numEntriesAndTombstones;
         }
-        if (counters.numEntries) {
+        if (counters.numEntries !== undefined) {
           row.num_live = counters.numEntries;
         }
       }
     });
     jstProcess(
         new JsEvalContext({ type_status: type_status_array }),
         $('typeInfo'));
   }
 
   /**
@@ skipping 153 matching lines @@
 
   return {
     onLoad: onLoad,
     addExpandListener: addExpandListener,
     highlightIfChanged: highlightIfChanged
   };
 });
 
 document.addEventListener(
     'DOMContentLoaded', chrome.sync.about_tab.onLoad, false);