Revert of ChromeOS NetworkScreenHandler should not call CheckAndResolveLocale on UI thread.

chrome/browser/chromeos/login/session/user_session_manager.cc

 // Copyright 2014 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/login/session/user_session_manager.h"
 
 #include <string>
 
 #include "base/base_paths.h"
 #include "base/bind.h"
@@ skipping 356 matching lines @@
   if (!chrome::IsRunningInForcedAppMode())
     return;
 
   chrome_client_id_ = chrome_client_id;
   chrome_client_secret_ = chrome_client_secret;
 }
 
 bool UserSessionManager::RespectLocalePreference(
     Profile* profile,
     const user_manager::User* user,
-    const locale_util::SwitchLanguageCallback& callback) const {
+    scoped_ptr<locale_util::SwitchLanguageCallback> callback) const {
   // TODO(alemate): http://crbug.com/288941 : Respect preferred language list in
   // the Google user profile.
   if (g_browser_process == NULL)
     return false;
 
   user_manager::UserManager* user_manager = user_manager::UserManager::Get();
   if (!user || (user_manager->IsUserLoggedIn() &&
                 user != user_manager->GetPrimaryUser())) {
     return false;
   }
@@ skipping 47 matching lines @@
   // are set up when the user first logs in. Then the user may customize the
   // input methods.  Hence changing input methods here, just because the user's
   // UI language is different from the login screen UI language, is not
   // desirable. Note that input method preferences are synced, so users can use
   // their farovite input methods as soon as the preferences are synced.
   //
   // For Guest mode, user locale preferences will never get initialized.
   // So input methods should be enabled somewhere.
   const bool enable_layouts =
       user_manager::UserManager::Get()->IsLoggedInAsGuest();
-  locale_util::SwitchLanguage(
-      pref_locale, enable_layouts, false /* login_layouts_only */, callback);
+  locale_util::SwitchLanguage(pref_locale,
+                              enable_layouts,
+                              false /* login_layouts_only */,
+                              callback.Pass());
 
   return true;
 }
 
 bool UserSessionManager::NeedsToUpdateEasyUnlockKeys() const {
   return !CommandLine::ForCurrentProcess()->HasSwitch(
              chromeos::switches::kDisableEasySignin) &&
          !user_context_.GetUserID().empty() &&
          user_context_.GetUserType() == user_manager::USER_TYPE_REGULAR &&
          user_context_.GetKey() && !user_context_.GetKey()->GetSecret().empty();
@@ skipping 660 matching lines @@
     return NULL;
   }
 
   if (!easy_unlock_key_manager_)
     easy_unlock_key_manager_.reset(new EasyUnlockKeyManager);
 
   return easy_unlock_key_manager_.get();
 }
 
 }  // namespace chromeos