Build WebRTC with data channel only.

webrtc/pc/peerconnection.h

Index: webrtc/pc/peerconnection.h
diff --git a/webrtc/pc/peerconnection.h b/webrtc/pc/peerconnection.h
index 289a5d87a7c581b90041953deea5e7b5e587f1c4..e563d513973d47038ae0b97d5d40c88de131eaed 100644
--- a/webrtc/pc/peerconnection.h
+++ b/webrtc/pc/peerconnection.h
@@ -61,7 +61,9 @@ class PeerConnection : public PeerConnectionInterface,
                        public rtc::MessageHandler,
                        public sigslot::has_slots<> {
  public:
-  explicit PeerConnection(PeerConnectionFactory* factory);
+  explicit PeerConnection(PeerConnectionFactory* factory,
+                          std::unique_ptr<RtcEventLog> event_log,
+                          std::unique_ptr<Call> call);
 
   bool Initialize(
       const PeerConnectionInterface::RTCConfiguration& configuration,
@@ -392,9 +394,6 @@ class PeerConnection : public PeerConnectionInterface,
   // This function should only be called from the worker thread.
   void StopRtcEventLog_w();
 
-  // Creates the |*call_| object. Must only be called from the worker thread.
-  void CreateCall_w();
-
   // Storing the factory as a scoped reference pointer ensures that the memory
   // in the PeerConnectionFactoryImpl remains available as long as the
   // PeerConnection is running. It is passed to PeerConnection as a raw pointer.