Use weak pointers instead of base::Unretained to prevent use after free

  return avrc_->FindService(

             UUID_SERVCLASS_AV_REMOTE_CONTROL, bdaddr, &db_params,

             base::Bind(&ConnectionHandler::SdpCb, base::Unretained(this),

                        bdaddr, cb, disc_db)) == AVRC_SUCCESS;

             base::Bind(&ConnectionHandler::SdpCb,

                        weak_ptr_factory_.GetWeakPtr(), bdaddr, cb, disc_db)) ==

         AVRC_SUCCESS;

}

bool ConnectionHandler::AvrcpConnect(bool initiator, const RawAddress& bdaddr) {

                                    weak_ptr_factory_.GetWeakPtr());

  }

  open_cb.msg_cback =

      base::Bind(&ConnectionHandler::MessageCb, base::Unretained(this));

      base::Bind(&ConnectionHandler::MessageCb, weak_ptr_factory_.GetWeakPtr());

  open_cb.company_id = AVRC_CO_GOOGLE;

  open_cb.conn = initiator ? AVRC_CONN_INT

                           : AVRC_CONN_ACP;  // 0 if initiator, 1 if acceptor

      LOG(INFO) << __PRETTY_FUNCTION__ << ": Connection Opened Event";

      auto&& callback = base::Bind(&ConnectionHandler::SendMessage,

                                   base::Unretained(this), handle);

                                   weak_ptr_factory_.GetWeakPtr(), handle);

      auto&& ctrl_mtu = avrc_->GetPeerMtu(handle) - AVCT_HDR_LEN;

      auto&& browse_mtu = avrc_->GetBrowseMtu(handle) - AVCT_HDR_LEN;

      std::shared_ptr<Device> newDevice = std::make_shared<Device>(