整理媒体事件相关代码，删除无须重载时的多余代码逻辑

src/Rtmp/RtmpSession.cpp

@@ -599,10 +599,6 @@ std::shared_ptr<SockInfo> RtmpSession::getOriginSock(MediaSource &sender) const
     return const_cast<RtmpSession *>(this)->shared_from_this();
 }
 
-toolkit::EventPoller::Ptr RtmpSession::getOwnerPoller(MediaSource &sender) {
-    return getPoller();
-}
-
 void RtmpSession::setSocketFlags(){
     GET_CONFIG(int, merge_write_ms, General::kMergeWriteMS);
     if (merge_write_ms > 0) {

src/Rtmp/RtmpSession.h

@@ -80,7 +80,6 @@ private:
     std::string getOriginUrl(MediaSource &sender) const override;
     // 获取媒体源客户端相关信息
     std::shared_ptr<SockInfo> getOriginSock(MediaSource &sender) const override;
-    toolkit::EventPoller::Ptr getOwnerPoller(MediaSource &sender) override;
 
     void setSocketFlags();
     std::string getStreamId(const std::string &str);