Update API for Objective-C RTCAudioTrack and RTCVideoTrack.

webrtc/api/BUILD.gn

Index: webrtc/api/BUILD.gn
diff --git a/webrtc/api/BUILD.gn b/webrtc/api/BUILD.gn
index 0e7a99a5d9a1cc33c0177c12970ea232eb5d35ab..91449842570bf0d7f8bc799d5c751fc57207ad8d 100644
--- a/webrtc/api/BUILD.gn
+++ b/webrtc/api/BUILD.gn
@@ -29,6 +29,9 @@ if (is_ios) {
     ]
     sources = [
       # Add these when there's a BUILD.gn for peer connection APIs
+      #"objc/RTCAudioTrack+Private.h",
+      #"objc/RTCAudioTrack.h",
+      #"objc/RTCAudioTrack.mm",s
       #"objc/RTCAVFoundationVideoSource+Private.h",
       #"objc/RTCAVFoundationVideoSource.h",
       #"objc/RTCAVFoundationVideoSource.mm",
@@ -44,6 +47,9 @@ if (is_ios) {
       #"objc/RTCVideoSource+Private.h",
       #"objc/RTCVideoSource.h",
       #"objc/RTCVideoSource.mm",
+      #"objc/RTCVideoTrack+Private.h",
+      #"objc/RTCVideoTrack.h",
+      #"objc/RTCVideoTrack.mm",
       "objc/RTCIceServer+Private.h",
       "objc/RTCIceServer.h",
       "objc/RTCIceServer.mm",