Hide/Disable several (meaningless) options in Settings uber-page for Guest.

chrome/browser/resources/options2/chromeos/accounts_options.js

Index: chrome/browser/resources/options2/chromeos/accounts_options.js
diff --git a/chrome/browser/resources/options2/chromeos/accounts_options.js b/chrome/browser/resources/options2/chromeos/accounts_options.js
index e4c0651a0666e68dc189469b9fed9bb5e057dbce..0afa56faf725d86905549cdc043981a7523a6184 100644
--- a/chrome/browser/resources/options2/chromeos/accounts_options.js
+++ b/chrome/browser/resources/options2/chromeos/accounts_options.js
@@ -160,6 +160,50 @@ cr.define('options', function() {
       $('userList').updateAccountPicture(username);
   };
 
+  /**
+   * Disable and mark page elements for Guest mode.
+   * It adds guest-disabled css class to all elements within given subtree,
+   * disables interactive elements (input/select/button), and removes href
+   * attribute from <a> elements.
+   *
+   * @param {Element} element Root element of DOM subtree that should be
+   * disabled.
+   */
+  AccountsOptions.disableElementsForGuest = function(element) {
+    AccountsOptions.disableElementForGuest_(element);
+
+    // Walk the tree, searching each ELEMENT node.
+    var walker = document.createTreeWalker(element,
+                                           NodeFilter.SHOW_ELEMENT,
+                                           null,
+                                           false);
+
+    var node = walker.nextNode();
+    while (node) {
+      AccountsOptions.disableElementForGuest_(node);
+      node = walker.nextNode();
+    }
+  };
+
+  /**
+   * Disables single element for Guest mode.
+   * It adds guest-disabled css class, adds disabled attribute for appropriate
+   * elements (input/select/button), and removes href attribute from
+   * <a> element.
+   *
+   * @private
+   * @param {Element} element Element that should be disabled.
+   */
+  AccountsOptions.disableElementForGuest_ = function(element) {
+    element.classList.add('guest-disabled')
+    if (element.nodeName == 'INPUT' ||
+        element.nodeName == 'SELECT' ||
+        element.nodeName == 'BUTTON')
+      element.disabled = true;
+    if (element.nodeName == 'A')
+      element.removeAttribute('href');
+  };
+
   // Export
   return {
     AccountsOptions: AccountsOptions