Disable the new window context menu option in the bookmarks extension for Windows 8 metro mode.

chrome/browser/resources/bookmark_manager/js/main.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.
 
 /** @const */ var BookmarkList = bmm.BookmarkList;
 /** @const */ var BookmarkTree = bmm.BookmarkTree;
 /** @const */ var Command = cr.ui.Command;
 /** @const */ var CommandBinding = cr.ui.CommandBinding;
 /** @const */ var LinkKind = cr.LinkKind;
 /** @const */ var ListItem = cr.ui.ListItem;
@@ skipping 834 matching lines @@
  *   - 'forced' for when incognito mode is forced (normal mode is unavailable).
  */
 var incognitoModeAvailability = 'enabled';
 chrome.systemPrivate.getIncognitoModeAvailability(function(result) {
   // TODO(rustema): propagate policy value to the bookmark manager when
   //                it changes.
   incognitoModeAvailability = result;
 });
 
 /**
+ * New Windows are not allowed in Windows 8 metro mode.
+ */
+var canOpenNewWindows = true;
+chrome.experimental.bookmarkManager.canOpenNewWindows(function(result) {
+    canOpenNewWindows = result;
+});
+
+/**
  * Helper function that updates the canExecute and labels for the open-like
  * commands.
  * @param {!cr.ui.CanExecuteEvent} e The event fired by the command system.
  * @param {!cr.ui.Command} command The command we are currently processing.
  */
 function updateOpenCommands(e, command) {
   var selectedItem = e.target.selectedItem;
   var selectionCount;
   if (e.target == tree) {
     selectionCount = selectedItem ? 1 : 0;
@@ skipping 19 matching lines @@
   switch (command.id) {
     case 'open-in-new-tab-command':
       command.label = loadTimeData.getString(multiple ?
           'open_all' : 'open_in_new_tab');
       break;
 
     case 'open-in-new-window-command':
       command.label = loadTimeData.getString(multiple ?
           'open_all_new_window' : 'open_in_new_window');
       // Disabled when incognito is forced.
-      commandDisabled = incognitoModeAvailability == 'forced';
+      commandDisabled = incognitoModeAvailability == 'forced' ||
+          !canOpenNewWindows;
       break;
     case 'open-incognito-window-command':
       command.label = loadTimeData.getString(multiple ?
           'open_all_incognito' : 'open_incognito');
       // Not available withn incognito is disabled.
       commandDisabled = incognitoModeAvailability == 'disabled';
       break;
   }
   e.canExecute = selectionCount > 0 && !!selectedItem && !commandDisabled;
   if (isFolder && e.canExecute) {
@@ skipping 732 matching lines @@
   document.addEventListener('copy', handle('copy-command'));
   document.addEventListener('cut', handle('cut-command'));
 
   var pasteHandler = handle('paste-command');
   document.addEventListener('paste', function(e) {
     // Paste is a bit special since we need to do an async call to see if we can
     // paste because the paste command might not be up to date.
     updatePasteCommand(pasteHandler);
   });
 })();