Don't allow elevation for CHROME_OS.

chrome/browser/resources/options/options.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.
 
 var AddLanguageOverlay = options.AddLanguageOverlay;
 var AlertOverlay = options.AlertOverlay;
 var AutofillEditAddressOverlay = options.AutofillEditAddressOverlay;
 var AutofillEditCreditCardOverlay = options.AutofillEditCreditCardOverlay;
 var AutofillOptions = options.AutofillOptions;
 var BrowserOptions = options.BrowserOptions;
@@ skipping 131 matching lines @@
   OptionsPage.registerOverlay(ImportDataOverlay.getInstance(),
                               BrowserOptions.getInstance());
   OptionsPage.registerOverlay(LanguageOptions.getInstance(),
                               BrowserOptions.getInstance(),
                               [$('language-button')]);
   OptionsPage.registerOverlay(ManageProfileOverlay.getInstance(),
                               BrowserOptions.getInstance());
   if (loadTimeData.getBoolean('managedUsersEnabled')) {
     OptionsPage.registerOverlay(ManagedUserSettingsExceptionsArea.getInstance(),
                                 ManagedUserSettings.getInstance());
-    OptionsPage.registerOverlay(ManagedUserSetPassphraseOverlay.getInstance(),
-                                ManagedUserSettings.getInstance(),
-                                [$('set-passphrase')]);
+    if (!cr.isChromeOS) {
+      OptionsPage.registerOverlay(ManagedUserSetPassphraseOverlay.getInstance(),
+                                  ManagedUserSettings.getInstance(),
+                                  [$('set-passphrase')]);
+    }
     OptionsPage.registerOverlay(ManagedUserSettings.getInstance(),
                                 BrowserOptions.getInstance(),
                                 [$('managed-user-settings-button')]);
   }
   OptionsPage.registerOverlay(MediaGalleriesManager.getInstance(),
                               ContentSettings.getInstance(),
                               [$('manage-galleries-button')]);
   OptionsPage.registerOverlay(PasswordManager.getInstance(),
                               BrowserOptions.getInstance(),
                               [$('manage-passwords')]);
@@ skipping 115 matching lines @@
   options.OptionsPage.willClose();
 };
 
 /**
  * Listener for the |popstate| event.
  * @param {Event} e The |popstate| event.
  */
 window.onpopstate = function(e) {
   options.OptionsPage.setState(e.state);
 };