Update API for Objective-C RTCAudioTrack and RTCVideoTrack.

webrtc/api/objc/RTCAudioTrack+Private.h

 /*
  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#import "RTCIceServer.h"
+#import "RTCAudioTrack.h"
 
-#include "talk/app/webrtc/peerconnectioninterface.h"
+#include "talk/app/webrtc/mediastreaminterface.h"
 
 NS_ASSUME_NONNULL_BEGIN
 
-@interface RTCIceServer ()
+@interface RTCAudioTrack ()
 
 /**
- * IceServer struct representation of this RTCIceServer object's data.
- * This is needed to pass to the underlying C++ APIs.
+ * AudioTrack representation of this RTCAudioTrack object. This is needed to
+ * pass to the underlying C++ APIs.
  */
 @property(nonatomic, readonly)
-    webrtc::PeerConnectionInterface::IceServer iceServer;
+    rtc::scoped_refptr<webrtc::AudioTrackInterface> nativeAudioTrack;
 
 @end
 
 NS_ASSUME_NONNULL_END