Delete MediaController class, move Call ownership to PeerConnection.

webrtc/pc/peerconnection.cc

Index: webrtc/pc/peerconnection.cc
diff --git a/webrtc/pc/peerconnection.cc b/webrtc/pc/peerconnection.cc
index a3981039e6cfe89554092b4c14d7f2f7b0f175e4..4e85e4bda8ab893fb34e4582062e9b87e06a413c 100644
--- a/webrtc/pc/peerconnection.cc
+++ b/webrtc/pc/peerconnection.cc
@@ -457,11 +457,10 @@ bool PeerConnection::Initialize(
     return false;
   }
 
-  media_controller_.reset(factory_->CreateMediaController(
-      configuration.media_config, event_log_.get()));
-
   session_.reset(new WebRtcSession(
-      media_controller_.get(), factory_->network_thread(),
+      factory_->channel_manager(), configuration.media_config,
+      event_log_.get(),
+      factory_->network_thread(),
       factory_->worker_thread(), factory_->signaling_thread(),
       port_allocator_.get(),
       std::unique_ptr<cricket::TransportController>(