Remove the unused and untested functions from VoERTP_RTCP.

webrtc/voice_engine/voe_rtp_rtcp_impl.h

Index: webrtc/voice_engine/voe_rtp_rtcp_impl.h
diff --git a/webrtc/voice_engine/voe_rtp_rtcp_impl.h b/webrtc/voice_engine/voe_rtp_rtcp_impl.h
index dcf28410a17fca9ae2f6ce751f7dba0a94850839..8b75682960dab27c53f7e2aeebe8f3cae9e3c270 100644
--- a/webrtc/voice_engine/voe_rtp_rtcp_impl.h
+++ b/webrtc/voice_engine/voe_rtp_rtcp_impl.h
@@ -28,14 +28,6 @@ class VoERTP_RTCPImpl : public VoERTP_RTCP {
 
   int GetRemoteRTCP_CNAME(int channel, char cName[256]) override;
 
-  int GetRemoteRTCPData(int channel,
-                        unsigned int& NTPHigh,
-                        unsigned int& NTPLow,
-                        unsigned int& timestamp,
-                        unsigned int& playoutTimestamp,
-                        unsigned int* jitter = NULL,
-                        unsigned short* fractionLost = NULL) override;
-
   // SSRC
   int SetLocalSSRC(int channel, unsigned int ssrc) override;
 
@@ -47,25 +39,9 @@ class VoERTP_RTCPImpl : public VoERTP_RTCP {
   int SetSendAudioLevelIndicationStatus(int channel,
                                         bool enable,
                                         unsigned char id) override;
-  int SetReceiveAudioLevelIndicationStatus(int channel,
-                                           bool enable,
-                                           unsigned char id) override;
-
-  // Statistics
-  int GetRTPStatistics(int channel,
-                       unsigned int& averageJitterMs,
-                       unsigned int& maxJitterMs,
-                       unsigned int& discardedPackets) override;
 
   int GetRTCPStatistics(int channel, CallStatistics& stats) override;
 
-  int GetRemoteRTCPReportBlocks(
-      int channel,
-      std::vector<ReportBlock>* report_blocks) override;
-
-  // NACK
-  int SetNACKStatus(int channel, bool enable, int maxNoPackets) override;
-
  protected:
   VoERTP_RTCPImpl(voe::SharedData* shared);
   ~VoERTP_RTCPImpl() override;