Remove leftover function signatures.

Change-Id: If9e6fef4225d4b2d8d8cac7f45afba4a23d8a3e9
Bug: webrtc:4690
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/291705
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Fredrik Solenberg <solenberg@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39249}
diff --git a/media/engine/webrtc_voice_engine.h b/media/engine/webrtc_voice_engine.h
index 8b62c67..1c06183 100644
--- a/media/engine/webrtc_voice_engine.h
+++ b/media/engine/webrtc_voice_engine.h
@@ -97,8 +97,6 @@
   // easily at any time.
   void ApplyOptions(const AudioOptions& options);
 
-  int CreateVoEChannel();
-
   webrtc::TaskQueueFactory* const task_queue_factory_;
   std::unique_ptr<rtc::TaskQueue> low_priority_worker_queue_;
 
@@ -251,8 +249,6 @@
   bool MuteStream(uint32_t ssrc, bool mute);
 
   WebRtcVoiceEngine* engine() { return engine_; }
-  int CreateVoEChannel();
-  bool DeleteVoEChannel(int channel);
   bool SetMaxSendBitrate(int bps);
   void SetupRecording();