Reenabled ChromeOS system setting for timezone selection....

chrome/browser/chromeos/cros_settings_names.cc

 // Copyright (c) 2010 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/chromeos/cros_settings_names.h"
 
 namespace chromeos {
 
 const char kCrosSettingsPrefix[]     = "cros.";
 
 const char kAccountsPrefAllowBWSI[]  = "cros.accounts.allowBWSI";
 const char kAccountsPrefAllowGuest[] = "cros.accounts.allowGuest";
 const char kAccountsPrefShowUserNamesOnSignIn[]
     = "cros.accounts.showUserNamesOnSignIn";
 const char kAccountsPrefUsers[]      = "cros.accounts.users";
 
+const char kSystemTimezone[]         = "cros.system.timezone";
 }  // namespace chromeos