Add a SigninAllowed policy.

chrome/browser/ui/toolbar/wrench_menu_model.cc

 // 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 "chrome/browser/ui/toolbar/wrench_menu_model.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/command_line.h"
@@ skipping 517 matching lines @@
   if (is_new_menu)
     CreateZoomMenu(is_new_menu);
   else
     AddSeparator(ui::NORMAL_SEPARATOR);
 
   AddItemWithStringId(IDC_SHOW_HISTORY, IDS_SHOW_HISTORY);
   AddItemWithStringId(IDC_SHOW_DOWNLOADS, IDS_SHOW_DOWNLOADS);
   AddSeparator(ui::NORMAL_SEPARATOR);
 
 #if !defined(OS_CHROMEOS)
-  // No "Sign in to Chromium..." menu item on ChromeOS.
-  const string16 short_product_name =
-      l10n_util::GetStringUTF16(IDS_SHORT_PRODUCT_NAME);
-  AddItem(IDC_SHOW_SYNC_SETUP, l10n_util::GetStringFUTF16(
-      IDS_SYNC_MENU_PRE_SYNCED_LABEL, short_product_name));
-  AddSeparator(ui::NORMAL_SEPARATOR);
+  if (browser_->profile()->GetOriginalProfile()->IsSigninAllowed()) {
+    // No "Sign in to Chromium..." menu item on ChromeOS.

[Andrew T Wilson (Slow), 2013/02/04 15:41:48]

Move this comment one line up so it's clear it refers to the #ifdef.

[Adrian Kuegel, 2013/02/05 10:55:15]

Done.

+    const string16 short_product_name =
+        l10n_util::GetStringUTF16(IDS_SHORT_PRODUCT_NAME);
+    AddItem(IDC_SHOW_SYNC_SETUP, l10n_util::GetStringFUTF16(
+        IDS_SYNC_MENU_PRE_SYNCED_LABEL, short_product_name));
+    AddSeparator(ui::NORMAL_SEPARATOR);
+  }
 #endif
 
   AddItemWithStringId(IDC_OPTIONS, IDS_SETTINGS);
 
 #if defined(OS_CHROMEOS)
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableRequestTabletSite))
     AddCheckItemWithStringId(IDC_TOGGLE_REQUEST_TABLET_SITE,
                              IDS_TOGGLE_REQUEST_TABLET_SITE);
 #endif
@@ skipping 136 matching lines @@
   bool enable_decrement = false;
   int zoom_percent = 100;
   if (browser_->tab_strip_model()->GetActiveWebContents()) {
     zoom_percent =
         browser_->tab_strip_model()->GetActiveWebContents()->GetZoomPercent(
             &enable_increment, &enable_decrement);
   }
   zoom_label_ = l10n_util::GetStringFUTF16(
       IDS_ZOOM_PERCENT, base::IntToString16(zoom_percent));
 }