Remove unused methods in WebRtcVoiceEngine and VoiceMediaChannel.

webrtc/media/engine/webrtcvoiceengine.h

Index: webrtc/media/engine/webrtcvoiceengine.h
diff --git a/webrtc/media/engine/webrtcvoiceengine.h b/webrtc/media/engine/webrtcvoiceengine.h
index 6c88bbf31bf93f4e388c0f7966e28ebaa036457a..ea48544924ae0ce5c096c05a404f7ff5798319d1 100644
--- a/webrtc/media/engine/webrtcvoiceengine.h
+++ b/webrtc/media/engine/webrtcvoiceengine.h
@@ -183,12 +183,6 @@ class WebRtcVoiceMediaChannel final : public VoiceMediaChannel,
   bool RemoveRecvStream(uint32_t ssrc) override;
   bool GetActiveStreams(AudioInfo::StreamList* actives) override;
   int GetOutputLevel() override;
-  int GetTimeSinceLastTyping() override;
-  void SetTypingDetectionParameters(int time_window,
-                                    int cost_per_typing,
-                                    int reporting_threshold,
-                                    int penalty_decay,
-                                    int type_event_delay) override;
   bool SetOutputVolume(uint32_t ssrc, double volume) override;
 
   bool CanInsertDtmf() override;