[MD settings] replace secondary-action with separator

chrome/browser/resources/settings/about_page/about_page.js

 // Copyright 2016 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.
 
 /**
  * @fileoverview 'settings-about-page' contains version and OS related
  * information.
  */
 Polymer({
   is: 'settings-about-page',
@@ skipping 208 matching lines @@
       return;
     }
 // </if>
     this.showUpdateStatus_ =
         this.currentUpdateStatusEvent_.status != UpdateStatus.DISABLED &&
         !this.obsoleteSystemInfo_.endOfLine;
   },
 
   /**
    * Hide the button container if all buttons are hidden, otherwise the
-   * container displayes an unwanted border (see secondary-action class).
+   * container displays an unwanted border (see separator class).
    * @private
    */
   updateShowButtonContainer_: function() {
 // <if expr="not chromeos">
     this.showButtonContainer_ = this.showRelaunch_;
 // </if>
 // <if expr="chromeos">
     this.showButtonContainer_ = this.showRelaunch_ ||
         this.showRelaunchAndPowerwash_ || this.showCheckUpdates_;
 // </if>
@@ skipping 181 matching lines @@
     });
   },
 
 // <if expr="_google_chrome">
   /** @private */
   onReportIssueTap_: function() {
     this.aboutBrowserProxy_.openFeedbackDialog();
   },
 // </if>
 });