Set AppLocale global preference on network screen.

chrome/browser/ui/webui/chromeos/login/network_screen_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/chromeos/login/network_screen_handler.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 294 matching lines @@
     } else {
       self->selected_language_code_ =
           CalculateSelectedLanguage(requested_locale, loaded_locale);
     }
   } else {
     self->selected_language_code_ = loaded_locale;
   }
 
   self->ReloadLocalizedContent();
 
+  // We still do not have device owner, so owner settings are not applied.
+  // But Guest session can be started before owner is created, so we need to
+  // save locale settings directly here.
+  g_browser_process->local_state()->SetString(prefs::kApplicationLocale,
+                                              self->selected_language_code_);
+
   AccessibilityManager::Get()->OnLocaleChanged();
 }
 
 void NetworkScreenHandler::HandleOnLanguageChanged(const std::string& locale) {
   const std::string app_locale = g_browser_process->GetApplicationLocale();
   if (app_locale == locale)
     return;
 
   base::WeakPtr<NetworkScreenHandler> weak_self =
       weak_ptr_factory_.GetWeakPtr();
@@ skipping 298 matching lines @@
     timezone_option->SetString("value", timezone_id);
     timezone_option->SetString("title", timezone_name);
     timezone_option->SetBoolean("selected", timezone_id == current_timezone_id);
     timezone_list->Append(timezone_option.release());
   }
 
   return timezone_list.release();
 }
 
 }  // namespace chromeos