Revert of Separating SCTP code from BaseChannel/MediaChannel.

webrtc/media/base/rtpdataengine.h

Index: webrtc/media/base/rtpdataengine.h
diff --git a/webrtc/media/base/rtpdataengine.h b/webrtc/media/base/rtpdataengine.h
index ca434940dc2bd7e3fbcd130375952682cbe9f453..adf0bef6e912a39eeea366f1ab84eccb991a1982 100644
--- a/webrtc/media/base/rtpdataengine.h
+++ b/webrtc/media/base/rtpdataengine.h
@@ -27,7 +27,8 @@ class RtpDataEngine : public DataEngineInterface {
  public:
   RtpDataEngine();
 
-  virtual DataMediaChannel* CreateChannel(const MediaConfig& config);
+  virtual DataMediaChannel* CreateChannel(DataChannelType data_channel_type,
+                                          const MediaConfig& config);
 
   virtual const std::vector<DataCodec>& data_codecs() {
     return data_codecs_;