Add header extension filtering for WebRtcVoiceEngine/MediaChannel.

talk/media/base/mediachannel.h

 /*
  * libjingle
  * Copyright 2004 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 395 matching lines @@
   bool operator==(const RtpHeaderExtension& ext) const {
     // id is a reserved word in objective-c. Therefore the id attribute has to
     // be a fully qualified name in order to compile on IOS.
     return this->id == ext.id &&
         uri == ext.uri;
   }
 
   std::string ToString() const {
     std::ostringstream ost;
     ost << "{";
-    ost << "id: , " << id;
     ost << "uri: " << uri;
+    ost << ", id: " << id;
     ost << "}";
     return ost.str();
   }
 
   std::string uri;
   int id;
   // TODO(juberti): SendRecv direction;
 };
 
 // Returns the named header extension if found among all extensions, NULL
@@ skipping 786 matching lines @@
   // Signal when the media channel is ready to send the stream. Arguments are:
   //     writable(bool)
   sigslot::signal1<bool> SignalReadyToSend;
   // Signal for notifying that the remote side has closed the DataChannel.
   sigslot::signal1<uint32_t> SignalStreamClosedRemotely;
 };
 
 }  // namespace cricket
 
 #endif  // TALK_MEDIA_BASE_MEDIACHANNEL_H_