Add a SigninAllowed policy.

chrome/browser/ui/webui/options/managed_user_settings_handler.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/webui/options/managed_user_settings_handler.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/values.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 18 matching lines @@
     { "getContentPacks", IDS_GET_CONTENT_PACKS_BUTTON },
     { "getContentPacksURL", IDS_GET_CONTENT_PACKS_URL },
     // Content pack restriction options.
     { "contentPackSettings", IDS_CONTENT_PACK_SETTINGS_LABEL },
     { "outsideContentPacksAllow", IDS_OUTSIDE_CONTENT_PACKS_ALLOW_RADIO },
     { "outsideContentPacksWarn", IDS_OUTSIDE_CONTENT_PACKS_WARN_RADIO },
     { "outsideContentPacksBlock", IDS_OUTSIDE_CONTENT_PACKS_BLOCK_RADIO },
     // Other managed user settings
     { "advancedManagedUserSettings", IDS_ADVANCED_MANAGED_USER_LABEL },
     { "enableSafeSearch", IDS_SAFE_SEARCH_ENABLED },
-    { "disableProfileSignIn", IDS_SIGNIN_SYNC_DISABLED },
+    { "allowProfileSignIn", IDS_SIGNIN_SYNC_ALLOWED },
     { "disableHistoryDeletion", IDS_HISTORY_DELETION_DISABLED },
     { "usePassphrase", IDS_USE_PASSPHRASE_LABEL },
     { "setPassphrase", IDS_SET_PASSPHRASE_BUTTON }
   };
 
   RegisterStrings(localized_strings, resources, arraysize(resources));
   RegisterTitle(localized_strings, "managedUserSettingsPage",
                 IDS_MANAGED_USER_SETTINGS_TITLE);
 
   localized_strings->SetBoolean(
       "managedUsersEnabled",
       CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableManagedUsers));
 }
 
 }  // namespace options