Move responsibility for RTP header extensions on video receive.

webrtc/call/flexfec_receive_stream_impl.cc

Index: webrtc/call/flexfec_receive_stream_impl.cc
diff --git a/webrtc/call/flexfec_receive_stream_impl.cc b/webrtc/call/flexfec_receive_stream_impl.cc
index f01043349892574f5d240cacd27583173c68ad71..eaaa5cd87fefba5091b6b0115ac4755d4ad1815b 100644
--- a/webrtc/call/flexfec_receive_stream_impl.cc
+++ b/webrtc/call/flexfec_receive_stream_impl.cc
@@ -43,13 +43,7 @@ std::string FlexfecReceiveStream::Config::ToString() const {
   if (!protected_media_ssrcs.empty())
     ss << protected_media_ssrcs[i];
   ss << "], transport_cc: " << (transport_cc ? "on" : "off");
-  ss << ", rtp_header_extensions: [";
-  i = 0;
-  for (; i + 1 < rtp_header_extensions.size(); ++i)
-    ss << rtp_header_extensions[i].ToString() << ", ";
-  if (!rtp_header_extensions.empty())
-    ss << rtp_header_extensions[i].ToString();
-  ss << "]}";
+  ss << "}";
   return ss.str();
 }