mac: Delete more 10.5-only code

chrome/browser/resources/help/help.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.
 
 <include src="../uber/uber_utils.js">
 
 cr.define('help', function() {
   /**
    * Encapsulated handling of the help page.
    */
@@ skipping 136 matching lines @@
         $('promote').hidden = false;
       } else if (state == 'disabled') {
         $('promote').disabled = true;
         $('promote').hidden = false;
       }
     },
 
     /**
      * @private
      */
-    setObsoleteOS_: function(obsolete) {
-      if (cr.isMac) {
-        var updateObsoleteOSContainer = $('update-obsolete-os-container');
-        if (updateObsoleteOSContainer) {
-          updateObsoleteOSContainer.hidden = !obsolete;
-        }
-      }
-    },
-
-    /**
-     * @private
-     */
     setOSVersion_: function(version) {
       if (!cr.isChromeOS)
         console.error('OS version unsupported on non-CrOS');
 
       $('os-version').parentNode.hidden = (version == '');
       $('os-version').textContent = version;
     },
 
     /**
      * @private
@@ skipping 110 matching lines @@
     HelpPage: HelpPage
   };
 });
 
 /**
  * onload listener to initialize the HelpPage.
  */
 window.onload = function() {
   help.HelpPage.getInstance().initialize();
 };