Define Stream base classes

webrtc/video/video_receive_stream.cc

Index: webrtc/video/video_receive_stream.cc
diff --git a/webrtc/video/video_receive_stream.cc b/webrtc/video/video_receive_stream.cc
index d0c17d649e8f668e6a47d38c45ee44a2c2ee2fc8..8e10223b1b3d1ab332ea7796e0825e36936cda1b 100644
--- a/webrtc/video/video_receive_stream.cc
+++ b/webrtc/video/video_receive_stream.cc
@@ -321,10 +321,10 @@ int VideoReceiveStream::RenderFrame(const uint32_t /*stream_id*/,
   return 0;
 }
 
-void VideoReceiveStream::SignalNetworkState(Call::NetworkState state) {
-  if (state == Call::kNetworkUp)
+void VideoReceiveStream::SignalNetworkState(NetworkState state) {
+  if (state == kNetworkUp)
     SetRtcpMode(config_.rtp.rtcp_mode);
-  if (state == Call::kNetworkDown)
+  if (state == kNetworkDown)
     vie_channel_->SetRTCPMode(kRtcpOff);
 }