Revert of Add the OnAddTrack callback for Objective-C wrapper.

webrtc/sdk/objc/Framework/Classes/RTCPeerConnection+Private.h

Index: webrtc/sdk/objc/Framework/Classes/RTCPeerConnection+Private.h
diff --git a/webrtc/sdk/objc/Framework/Classes/RTCPeerConnection+Private.h b/webrtc/sdk/objc/Framework/Classes/RTCPeerConnection+Private.h
index 963b5f6bf9ce63cb9bbf779b8f157a61ae5d7963..60ab868a7c515a9dec6a54f7a4eafe008826cb29 100644
--- a/webrtc/sdk/objc/Framework/Classes/RTCPeerConnection+Private.h
+++ b/webrtc/sdk/objc/Framework/Classes/RTCPeerConnection+Private.h
@@ -49,12 +49,8 @@
   void OnIceCandidatesRemoved(
       const std::vector<cricket::Candidate>& candidates) override;
 
-  void OnAddTrack(
-      rtc::scoped_refptr<RtpReceiverInterface> receiver,
-      const std::vector<rtc::scoped_refptr<MediaStreamInterface>>& streams) override;
-
  private:
-  __weak RTCPeerConnection* peer_connection_;
+  __weak RTCPeerConnection *peer_connection_;
 };
 
 } // namespace webrtc
@@ -106,11 +102,6 @@
 + (webrtc::PeerConnectionInterface::StatsOutputLevel)
     nativeStatsOutputLevelForLevel:(RTCStatsOutputLevel)level;
 
-- (RTCMediaStream *)mediaStreamForNativeStream:
-    (rtc::scoped_refptr<webrtc::MediaStreamInterface>)stream;
-
-- (void)removeNativeMediaStream:(rtc::scoped_refptr<webrtc::MediaStreamInterface>)stream;
-
 @end
 
 NS_ASSUME_NONNULL_END