Implement Non-Closable Notification

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 f71e52b0a419002f3cdc2d45821ca2309c85be65..af562a48fbc91c70781583028fcbfead34e9ebfe 100644
--- a/ui/message_center/message_center_impl.h
+++ b/ui/message_center/message_center_impl.h
@@ -60,6 +60,7 @@ class MessageCenterImpl : public MessageCenter,
   void RemoveNotification(const std::string& id, bool by_user) override;
   void RemoveAllNotifications(bool by_user) override;
   void RemoveAllVisibleNotifications(bool by_user) override;
+  void RemoveAllClosableNotifications(bool by_user) override;
   void SetNotificationIcon(const std::string& notification_id,
                            const gfx::Image& image) override;
   void SetNotificationImage(const std::string& notification_id,
@@ -116,7 +117,8 @@ class MessageCenterImpl : public MessageCenter,
     size_t unread_count;
   };
 
-  void RemoveNotifications(bool by_user, const NotificationBlockers& blockers);
+  void RemoveNotifications(
+      bool by_user, bool only_closable, const NotificationBlockers& blockers);
   void RemoveNotificationsForNotifierId(const NotifierId& notifier_id);
 
   scoped_ptr<NotificationList> notification_list_;