Move responsibility for RTP header extensions on video receive.

call/video_receive_stream.cc

 /*
  *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 100 matching lines @@
   ss << ", transport_cc: " << (transport_cc ? "on" : "off");
   ss << ", nack: {rtp_history_ms: " << nack.rtp_history_ms << '}';
   ss << ", ulpfec_payload_type: " << ulpfec_payload_type;
   ss << ", red_type: " << red_payload_type;
   ss << ", rtx_ssrc: " << rtx_ssrc;
   ss << ", rtx_payload_types: {";
   for (auto& kv : rtx_associated_payload_types) {
     ss << kv.first << " (pt) -> " << kv.second << " (apt), ";
   }
   ss << '}';
-  ss << ", extensions: [";
-  for (size_t i = 0; i < extensions.size(); ++i) {
-    ss << extensions[i].ToString();
-    if (i != extensions.size() - 1)
-      ss << ", ";
-  }
-  ss << ']';
   ss << '}';
   return ss.str();
 }
 
 }  // namespace webrtc