Removed old login screen from source.

chrome/browser/chromeos/login/existing_user_controller.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/login/existing_user_controller.h"
 
 #include <algorithm>
 #include <functional>
 #include <map>
 
@@ skipping 97 matching lines @@
                         controllers[i]->is_guest() ||
                         visible_display_names[display_name] > 1;
     controllers[i]->EnableNameTooltip(show_tooltip);
   }
 }
 
 }  // namespace
 
 ExistingUserController*
   ExistingUserController::delete_scheduled_instance_ = NULL;
+ExistingUserController*
+  ExistingUserController::current_controller_ = NULL;
 
 // TODO(xiyuan): Wait for the cached settings update before using them.
 ExistingUserController::ExistingUserController(
     const std::vector<UserManager::User>& users,
     const gfx::Rect& background_bounds)
     : background_bounds_(background_bounds),
       background_window_(NULL),
       background_view_(NULL),
       selected_view_index_(kNotSelected),
       num_login_attempts_(0),
       bubble_(NULL),
       user_settings_(new UserCrosSettingsProvider),
       method_factory_(this) {
   if (delete_scheduled_instance_)
     delete_scheduled_instance_->Delete();
+  DCHECK(current_controller_ == NULL);
+  current_controller_ = this;
 
   // Caclulate the max number of users from available screen size.
   if (UserCrosSettingsProvider::cached_show_users_on_signin()) {
     size_t max_users = kMaxUsers;
     int screen_width = background_bounds.width();
     if (screen_width > 0) {
       max_users = std::max(static_cast<size_t>(2), std::min(kMaxUsers,
           static_cast<size_t>((screen_width - login::kUserImageSize)
                               / (UserController::kUnselectedSize +
                                  UserController::kPadding))));
@@ skipping 93 matching lines @@
 
 ExistingUserController::~ExistingUserController() {
   ClearErrors();
 
   if (background_window_)
     background_window_->Close();
 
   WmMessageListener::instance()->RemoveObserver(this);
 
   STLDeleteElements(&controllers_);
+  DCHECK(current_controller_ != NULL);
+  current_controller_ = NULL;
 }
 
 void ExistingUserController::Delete() {
   delete_scheduled_instance_ = NULL;
   delete this;
 }
 
 void ExistingUserController::ProcessWmMessage(const WmIpc::Message& message,
                                               GdkWindow* window) {
   if (message.type() != WM_IPC_MESSAGE_CHROME_CREATE_GUEST_WINDOW)
@@ skipping 357 matching lines @@
 void ExistingUserController::RecoverEncryptedData(
     const std::string& old_password) {
   login_performer_->RecoverEncryptedData(old_password);
 }
 
 void ExistingUserController::ResyncEncryptedData() {
   login_performer_->ResyncEncryptedData();
 }
 
 }  // namespace chromeos