Hide icons in message center on lock screen

ui/message_center/views/message_center_view.h

 // Copyright (c) 2013 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 UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_VIEW_H_
 #define UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_VIEW_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
@@ skipping 89 matching lines @@
 
   enum class Mode { NOTIFICATIONS, SETTINGS, BUTTONS_ONLY };
 
   static bool disable_animation_for_testing;
 
   void AddNotificationAt(const Notification& notification, int index);
   base::string16 GetButtonBarTitle() const;
   void Update(bool animate);
   void SetVisibilityMode(Mode mode, bool animate);
   void UpdateButtonBarStatus();
+  void EnableCloseAllIfAppropriate();
   void SetNotificationViewForTest(MessageView* view);
 
   MessageCenter* message_center_;  // Weak reference.
   MessageCenterTray* tray_;  // Weak reference.
 
   // Map notification_id->MessageView*. It contains all MessageViews currently
   // displayed in MessageCenter.
   typedef std::map<std::string, MessageView*> NotificationViewsMap;
   NotificationViewsMap notification_views_;  // Weak.
 
@@ skipping 28 matching lines @@
   Mode mode_ = Mode::BUTTONS_ONLY;
 
   std::unique_ptr<MessageViewContextMenuController> context_menu_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageCenterView);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_VIEW_H_