Revert of Moving MediaStreamSignaling logic into PeerConnection.

talk/app/webrtc/sctputils.h

 /*
  * libjingle
  * Copyright 2013 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 21 matching lines @@
 
 #include "talk/app/webrtc/datachannelinterface.h"
 
 namespace rtc {
 class Buffer;
 }  // namespace rtc
 
 namespace webrtc {
 struct DataChannelInit;
 
-// Read the message type and return true if it's an OPEN message.
-bool IsOpenMessage(const rtc::Buffer& payload);
-
 bool ParseDataChannelOpenMessage(const rtc::Buffer& payload,
                                  std::string* label,
                                  DataChannelInit* config);
 
 bool ParseDataChannelOpenAckMessage(const rtc::Buffer& payload);
 
 bool WriteDataChannelOpenMessage(const std::string& label,
                                  const DataChannelInit& config,
                                  rtc::Buffer* payload);
 
 void WriteDataChannelOpenAckMessage(rtc::Buffer* payload);
 }  // namespace webrtc
 
 #endif  // TALK_APP_WEBRTC_SCTPUTILS_H_