Don't allow elevation for CHROME_OS.

chrome/browser/resources/extensions/extensions.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"></include>
 <include src="extension_commands_overlay.js"></include>
 <include src="extension_focus_manager.js"></include>
 <include src="extension_list.js"></include>
 <include src="pack_extension_overlay.js"></include>
 
@@ skipping 69 matching lines @@
 
       // This will request the data to show on the page and will get a response
       // back in returnExtensionsData.
       chrome.send('extensionSettingsRequestExtensionsData');
 
       $('toggle-dev-on').addEventListener('change',
           this.handleToggleDevMode_.bind(this));
       $('dev-controls').addEventListener('webkitTransitionEnd',
           this.handleDevControlsTransitionEnd_.bind(this));
 
-      $('unlock-button').addEventListener('click', function() {
-        chrome.send('setElevated', [true]);
-      });
+      if (!cr.isChromeOS) {
+        $('unlock-button').addEventListener('click', function() {
+          chrome.send('setElevated', [true]);
+        });
 
-      $('lock-button').addEventListener('click', function() {
-        chrome.send('setElevated', [false]);
-      });
+        $('lock-button').addEventListener('click', function() {
+          chrome.send('setElevated', [false]);
+        });
+      }
 
       // Set up the three dev mode buttons (load unpacked, pack and update).
       $('load-unpacked').addEventListener('click',
           this.handleLoadUnpackedExtension_.bind(this));
       $('pack-extension').addEventListener('click',
           this.handlePackExtension_.bind(this));
       $('update-extensions-now').addEventListener('click',
           this.handleUpdateExtensionNow_.bind(this));
 
       if (!loadTimeData.getBoolean('offStoreInstallEnabled')) {
@@ skipping 261 matching lines @@
   return {
     ExtensionSettings: ExtensionSettings
   };
 });
 
 var ExtensionSettings = extensions.ExtensionSettings;
 
 window.addEventListener('load', function(e) {
   ExtensionSettings.getInstance().initialize();
 });