Support building WebRTC without audio and video for IOS

webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnectionFactory+Private.h

Index: webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnectionFactory+Private.h
diff --git a/webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnectionFactory+Private.h b/webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnectionFactory+Private.h
index ed1807783b43325ddcafd32cfd9b343368e2d686..ec84860e751288a0df04afc458e50bedb3642f21 100644
--- a/webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnectionFactory+Private.h
+++ b/webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnectionFactory+Private.h
@@ -15,7 +15,13 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-@interface RTCPeerConnectionFactory ()
+@interface RTCPeerConnectionFactory () {
+  std::unique_ptr<rtc::Thread> _networkThread;

[tkchin_webrtc, 2017/06/20 21:51:24]

style: don't declare ivars in @interface decls

If you need them shared, declare them as properties instead

+  std::unique_ptr<rtc::Thread> _workerThread;
+  std::unique_ptr<rtc::Thread> _signalingThread;
+  BOOL _hasStartedAecDump;
+  rtc::scoped_refptr<webrtc::PeerConnectionFactoryInterface> _nativeFactory;
+}
 
 /**
  * PeerConnectionFactoryInterface created and held by this