[Graph]: use shared_ptr for callback.
[Graph]: use shared_ptr for callback.

flashxio/FlashX,zheng-da/FlashX,icoming/FlashGraph,icoming/FlashGraph,flashxio/FlashX,icoming/FlashGraph,icoming/FlashGraph,flashxio/FlashX,zheng-da/FlashX,icoming/FlashGraph,icoming/FlashX,zheng-da/FlashX,flashxio/FlashX,zheng-da/FlashX,icoming/FlashX,flashxio/FlashX,icoming/FlashX,flashxio/FlashX,icoming/FlashX,icoming/FlashX,zheng-da/FlashX