Revert of Show message center on lock screen

ui/message_center/fake_message_center.h

 // Copyright 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_FAKE_MESSAGE_CENTER_H_
 #define UI_MESSAGE_CENTER_FAKE_MESSAGE_CENTER_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
@@ skipping 12 matching lines @@
 
   // Overridden from FakeMessageCenter.
   void AddObserver(MessageCenterObserver* observer) override;
   void RemoveObserver(MessageCenterObserver* observer) override;
   void AddNotificationBlocker(NotificationBlocker* blocker) override;
   void RemoveNotificationBlocker(NotificationBlocker* blocker) override;
   size_t NotificationCount() const override;
   size_t UnreadNotificationCount() const override;
   bool HasPopupNotifications() const override;
   bool IsQuietMode() const override;
-  bool IsLockedState() const override;
   bool HasClickedListener(const std::string& id) override;
   message_center::Notification* FindVisibleNotificationById(
       const std::string& id) override;
   const NotificationList::Notifications& GetVisibleNotifications() override;
   NotificationList::PopupNotifications GetPopupNotifications() override;
   void AddNotification(std::unique_ptr<Notification> notification) override;
   void UpdateNotification(
       const std::string& old_id,
       std::unique_ptr<Notification> new_notification) override;
 
@@ skipping 13 matching lines @@
   void ClickOnNotificationButton(const std::string& id,
                                  int button_index) override;
   void ClickOnSettingsButton(const std::string& id) override;
   void MarkSinglePopupAsShown(const std::string& id,
                               bool mark_notification_as_read) override;
   void DisplayedNotification(const std::string& id,
                              const DisplaySource source) override;
   void SetNotifierSettingsProvider(NotifierSettingsProvider* provider) override;
   NotifierSettingsProvider* GetNotifierSettingsProvider() override;
   void SetQuietMode(bool in_quiet_mode) override;
-  void SetLockedState(bool locked) override;
   void EnterQuietModeWithExpire(const base::TimeDelta& expires_in) override;
   void SetVisibility(Visibility visible) override;
   bool IsMessageCenterVisible() const override;
   void RestartPopupTimers() override;
   void PausePopupTimers() override;
 
  protected:
   void DisableTimersForTest() override;
   void EnableChangeQueueForTest(bool enabled) override;
 
  private:
   const NotificationList::Notifications empty_notifications_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeMessageCenter);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_FAKE_MESSAGE_CENTER_H_