Fixing notification message crash on fast dismissal click

ash/system/user/user_view.h

 // 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.
 
 #ifndef ASH_SYSTEM_USER_USER_VIEW_H_
 #define ASH_SYSTEM_USER_USER_VIEW_H_
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/user/login_status.h"
 #include "ash/system/user/tray_user.h"
 #include "base/macros.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/layout/box_layout.h"
 #include "ui/views/mouse_watcher.h"
 #include "ui/views/view.h"
 
 namespace gfx {
 class Rect;
 class Size;
 }
 
+namespace views {
+class FocusManager;
+}
+
 namespace ash {
 
 class PopupMessage;
 class SystemTrayItem;
 
 namespace tray {
 
 // The view of a user item in system tray bubble.
 class UserView : public views::View,
                  public views::ButtonListener,
@@ skipping 55 matching lines @@
 
   // True when the add user panel is visible but not activatable.
   bool add_user_disabled_;
 
   // True if this view will be used inside detailed view.
   bool for_detailed_view_;
 
   // The mouse watcher which takes care of out of window hover events.
   scoped_ptr<views::MouseWatcher> mouse_watcher_;
 
+  // The focus manager which we use to detect focus changes.
+  views::FocusManager* focus_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(UserView);
 };
 
 }  // namespace tray
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_USER_USER_VIEW_H_