Revert the revert. This change was not the cause of the failures, so relanding.

chrome/browser/resources/sync_internals/about.html

 <script src="chrome://sync-internals/about.js"></script>
 
 <style>
 div.column {
   display: inline-block;
   padding-right: 5em;
   vertical-align: top;
 }
 
 div#aboutInfo h2 {
@@ skipping 25 matching lines @@
   <p jsdisplay="failed_data_types">
     <span class="err" jscontent="failed_data_types"></span>
   </p>
 
   <h2>Sync URL</h2>
   <p jscontent="service_url"/>
 
   <h2>Details</h2>
   <table id="aboutDetails">
     <tr>
+      <td>Version</td>
+      <td jscontent="version"/>
+    </tr>
+    <tr>
       <td>Authenticated</td>
       <td>
         <span jscontent="authenticated"></span>
         <span jsdisplay="!authenticated" class="err" jscontent="auth_problem"></span>
       </td>
     </tr>
     <tr>
       <td>Last Synced</td>
       <td jscontent="time_since_sync"/>
     </tr>
@@ skipping 17 matching lines @@
 <div class="column">
   <h2>Actionable Error</h2>
   <table id="actionableError">
     <tr jsselect="actionable_error">
       <td jscontent="stat_name"/>
       <td jscontent="stat_value"/>
     </tr>
   </table>
 </div>
 </div>