Revert of Show message center on lock screen

ash/system/web_notification/web_notification_tray.cc

Index: ash/system/web_notification/web_notification_tray.cc
diff --git a/ash/system/web_notification/web_notification_tray.cc b/ash/system/web_notification/web_notification_tray.cc
index 5c102cc3f42bde44937df7f2c139fe4bda86603f..e8c9e70bc73f43388104dcc6546d6b0ba0f2b15a 100644
--- a/ash/system/web_notification/web_notification_tray.cc
+++ b/ash/system/web_notification/web_notification_tray.cc
@@ -302,8 +302,9 @@
 // Private methods.
 
 bool WebNotificationTray::ShouldShowMessageCenter() {
-  return !(status_area_widget()->system_tray() &&
-           status_area_widget()->system_tray()->HasNotificationBubble());
+  return status_area_widget()->login_status() != user::LOGGED_IN_LOCKED &&
+      !(status_area_widget()->system_tray() &&
+        status_area_widget()->system_tray()->HasNotificationBubble());
 }
 
 bool WebNotificationTray::ShouldBlockShelfAutoHide() const {
@@ -326,7 +327,6 @@
 
 void WebNotificationTray::UpdateAfterLoginStatusChange(
     user::LoginStatus login_status) {
-  message_center()->SetLockedState(login_status == user::LOGGED_IN_LOCKED);
   OnMessageCenterTrayChanged();
 }
 
@@ -409,7 +409,8 @@
                                ->session_state_delegate()
                                ->IsInSecondaryLoginScreen();
 
-  return login_status != user::LOGGED_IN_NONE && !userAddingRunning;
+  return login_status != user::LOGGED_IN_NONE
+      && login_status != user::LOGGED_IN_LOCKED && !userAddingRunning;
 }
 
 message_center::MessageCenterTray* WebNotificationTray::GetMessageCenterTray() {
@@ -477,6 +478,7 @@
                                ->IsInSecondaryLoginScreen();
 
   SetVisible((status_area_widget()->login_status() != user::LOGGED_IN_NONE) &&
+             (status_area_widget()->login_status() != user::LOGGED_IN_LOCKED) &&
              !userAddingRunning);
   Layout();
   SchedulePaint();