Move responsibility for RTP header extensions on video receive.

call/video_receive_stream.cc

Index: call/video_receive_stream.cc
diff --git a/call/video_receive_stream.cc b/call/video_receive_stream.cc
index f338805746db4848a1430054451ba077c4f021e0..4643e3015044e92fe408b0789ab5c5879ebd8fa3 100644
--- a/call/video_receive_stream.cc
+++ b/call/video_receive_stream.cc
@@ -118,13 +118,6 @@ std::string VideoReceiveStream::Config::Rtp::ToString() const {
     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();
 }