Delete MediaController class, move Call ownership to PeerConnection.

webrtc/pc/peerconnection.h

Index: webrtc/pc/peerconnection.h
diff --git a/webrtc/pc/peerconnection.h b/webrtc/pc/peerconnection.h
index 02f56f6c68a3e6dfe64cc6cb24986340e7ee3636..23e7e8e58b083b035872dd137efeeb4f2e82bf92 100644
--- a/webrtc/pc/peerconnection.h
+++ b/webrtc/pc/peerconnection.h
@@ -390,6 +390,9 @@ 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.
@@ -405,9 +408,8 @@ class PeerConnection : public PeerConnectionInterface,
   PeerConnectionInterface::RTCConfiguration configuration_;
 
   std::unique_ptr<cricket::PortAllocator> port_allocator_;
-  // The EventLog needs to outlive the media controller.
+  // The EventLog needs to outlive |call_|.
   std::unique_ptr<RtcEventLog> event_log_;
-  std::unique_ptr<MediaControllerInterface> media_controller_;
 
   // One PeerConnection has only one RTCP CNAME.
   // https://tools.ietf.org/html/draft-ietf-rtcweb-rtp-usage-26#section-4.9
@@ -440,6 +442,7 @@ class PeerConnection : public PeerConnectionInterface,
       rtc::scoped_refptr<RtpReceiverProxyWithInternal<RtpReceiverInternal>>>
       receivers_;
   std::unique_ptr<WebRtcSession> session_;
+  std::unique_ptr<Call> call_;
   std::unique_ptr<StatsCollector> stats_;
   rtc::scoped_refptr<RTCStatsCollector> stats_collector_;
 };