Don't allow elevation for CHROME_OS.

chrome/browser/resources/options/managed_user_settings.js

Index: chrome/browser/resources/options/managed_user_settings.js
diff --git a/chrome/browser/resources/options/managed_user_settings.js b/chrome/browser/resources/options/managed_user_settings.js
index fb51882ed4ad6f87603761f44b7bf6f5477ea957..9890c61fb5ffef486309459a593b5d34586628b3 100644
--- a/chrome/browser/resources/options/managed_user_settings.js
+++ b/chrome/browser/resources/options/managed_user_settings.js
@@ -83,21 +83,23 @@ cr.define('options', function() {
 
       var self = this;
 
-      $('lock-settings').onclick = function() {
-        chrome.send('setElevated', [false]);
-        // The managed user is currently authenticated, so don't wait for a
-        // callback to set the new authentication state since a reset to not
-        // elevated is done without showing the passphrase dialog.
-        self.authenticationState = ManagedUserAuthentication.UNAUTHENTICATED;
-        self.enableControls(false);
-      };
-
-      $('unlock-settings').onclick = function() {
-        if (self.authenticationState == ManagedUserAuthentication.CHECKING)
-          return;
-        self.authenticationState = ManagedUserAuthentication.CHECKING;
-        chrome.send('setElevated', [true]);
-      };
+      if (!cr.isChromeOS) {
+        $('lock-settings').onclick = function() {
+          chrome.send('setElevated', [false]);
+          // The managed user is currently authenticated, so don't wait for a
+          // callback to set the new authentication state since a reset to not
+          // elevated is done without showing the passphrase dialog.
+          self.authenticationState = ManagedUserAuthentication.UNAUTHENTICATED;
+          self.enableControls(false);
+        };
+
+        $('unlock-settings').onclick = function() {
+          if (self.authenticationState == ManagedUserAuthentication.CHECKING)
+            return;
+          self.authenticationState = ManagedUserAuthentication.CHECKING;
+          chrome.send('setElevated', [true]);
+        };
+      }
     },
 
     /** @override */