remove duplicate code (#4570)

getRecvSpeed和getRecvTotalBytes这两函数已在RtspPlayer中实现了，就没必要在RtspPlayerImp中再实现一遍了吧.

src/Rtsp/RtspPlayerImp.h

@@ -59,36 +59,6 @@ public:
 
     std::vector<Track::Ptr> getTracks(bool ready = true) const override;
 
-    size_t getRecvSpeed() override {
-        size_t ret = TcpClient::getRecvSpeed();
-        for (auto &rtp : _rtp_sock) {
-            if (rtp) {
-                ret += rtp->getRecvSpeed();
-            }
-        }
-        for (auto &rtcp : _rtcp_sock) {
-            if (rtcp) {
-                ret += rtcp->getRecvSpeed();
-            }
-        }
-        return ret;
-    }
-
-    size_t getRecvTotalBytes() override {
-        size_t ret = TcpClient::getRecvTotalBytes();
-        for (auto &rtp : _rtp_sock) {
-            if (rtp) {
-                ret += rtp->getRecvTotalBytes();
-            }
-        }
-        for (auto &rtcp : _rtcp_sock) {
-            if (rtcp) {
-                ret += rtcp->getRecvTotalBytes();
-            }
-        }
-        return ret;
-    }
-
 private:
     // 派生类回调函数  [AUTO-TRANSLATED:61e20903]
     // Derived class callback function