Support building WebRTC without audio and video for IOS

webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnection.mm

Index: webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnection.mm
diff --git a/webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnection.mm b/webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnection.mm
index 311e0dd886e49a37d33ea0d3dbfe30e93868600e..2ea487ba30b8e2d2d7972710218e419225273a7b 100644
--- a/webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnection.mm
+++ b/webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnection.mm
@@ -125,24 +125,6 @@ void PeerConnectionDelegateAdapter::OnSignalingChange(
                    didChangeSignalingState:state];
 }
 
-void PeerConnectionDelegateAdapter::OnAddStream(
-    rtc::scoped_refptr<MediaStreamInterface> stream) {
-  RTCMediaStream *mediaStream =
-      [[RTCMediaStream alloc] initWithNativeMediaStream:stream];
-  RTCPeerConnection *peer_connection = peer_connection_;
-  [peer_connection.delegate peerConnection:peer_connection
-                              didAddStream:mediaStream];
-}
-
-void PeerConnectionDelegateAdapter::OnRemoveStream(
-    rtc::scoped_refptr<MediaStreamInterface> stream) {
-  RTCMediaStream *mediaStream =
-      [[RTCMediaStream alloc] initWithNativeMediaStream:stream];
-  RTCPeerConnection *peer_connection = peer_connection_;
-  [peer_connection.delegate peerConnection:peer_connection
-                           didRemoveStream:mediaStream];
-}
-
 void PeerConnectionDelegateAdapter::OnDataChannel(
     rtc::scoped_refptr<DataChannelInterface> data_channel) {
   RTCDataChannel *dataChannel =
@@ -400,9 +382,7 @@ void PeerConnectionDelegateAdapter::OnIceCandidatesRemoved(
   std::string nativeStreamId = [NSString stdStringForString:streamId];
   rtc::scoped_refptr<webrtc::RtpSenderInterface> nativeSender(
       _peerConnection->CreateSender(nativeKind, nativeStreamId));
-  return nativeSender ?
-      [[RTCRtpSender alloc] initWithNativeRtpSender:nativeSender]
-      : nil;
+  return nativeSender ? [[RTCRtpSender alloc] initWithNativeRtpSender:nativeSender] : nil;
 }
 
 - (NSArray<RTCRtpSender *> *)senders {
@@ -410,8 +390,7 @@ void PeerConnectionDelegateAdapter::OnIceCandidatesRemoved(
       _peerConnection->GetSenders());
   NSMutableArray *senders = [[NSMutableArray alloc] init];
   for (const auto &nativeSender : nativeSenders) {
-    RTCRtpSender *sender =
-        [[RTCRtpSender alloc] initWithNativeRtpSender:nativeSender];
+    RTCRtpSender *sender = [[RTCRtpSender alloc] initWithNativeRtpSender:nativeSender];
     [senders addObject:sender];
   }
   return senders;
@@ -422,8 +401,7 @@ void PeerConnectionDelegateAdapter::OnIceCandidatesRemoved(
       _peerConnection->GetReceivers());
   NSMutableArray *receivers = [[NSMutableArray alloc] init];
   for (const auto &nativeReceiver : nativeReceivers) {
-    RTCRtpReceiver *receiver =
-        [[RTCRtpReceiver alloc] initWithNativeRtpReceiver:nativeReceiver];
+    RTCRtpReceiver *receiver = [[RTCRtpReceiver alloc] initWithNativeRtpReceiver:nativeReceiver];
     [receivers addObject:receiver];
   }
   return receivers;