Revert of Show message center on lock screen

ui/message_center/message_center_impl.h

Index: ui/message_center/message_center_impl.h
diff --git a/ui/message_center/message_center_impl.h b/ui/message_center/message_center_impl.h
index 46ff15e3a43b22a73965df83ec363ca34c4e9730..bac09cb0e16d122067b44d3ae7aacdf41138a831 100644
--- a/ui/message_center/message_center_impl.h
+++ b/ui/message_center/message_center_impl.h
@@ -49,7 +49,6 @@
   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;
@@ -80,7 +79,6 @@
   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 RestartPopupTimers() override;
   void PausePopupTimers() override;
@@ -128,9 +126,6 @@
   NotifierSettingsProvider* settings_provider_;
   std::vector<NotificationBlocker*> blockers_;
 
-  bool locked_ = false;
-  bool visible_ = false;
-
   // Queue for the notifications to delay the addition/updates when the message
   // center is visible.
   std::unique_ptr<internal::ChangeQueue> notification_queue_;