Revert of Separating SCTP code from BaseChannel/MediaChannel.

webrtc/media/base/mediaconstants.h

Index: webrtc/media/base/mediaconstants.h
diff --git a/webrtc/media/base/mediaconstants.h b/webrtc/media/base/mediaconstants.h
index 44d8c7ee0113a2b1fddaf500513ab19ffec857a0..547839afdbeba1cdab82dd75153fede554a4f6a6 100644
--- a/webrtc/media/base/mediaconstants.h
+++ b/webrtc/media/base/mediaconstants.h
@@ -106,9 +106,9 @@ extern const char kCodecParamStartBitrate[];
 extern const char kCodecParamMaxQuantization[];
 extern const char kCodecParamPort[];
 
-// We put the data codec names here so callers of DataEngine::CreateChannel
-// don't have to import rtpdataengine.h to get the codec names they want to
-// pass in.
+// We put the data codec names here so callers of
+// DataEngine::CreateChannel don't have to import rtpdataengine.h or
+// sctpdataengine.h to get the codec names they want to pass in.
 extern const int kGoogleRtpDataCodecPlType;
 extern const char kGoogleRtpDataCodecName[];