Revert of Moving MediaStreamSignaling logic into PeerConnection.

talk/app/webrtc/sctputils.h

Index: talk/app/webrtc/sctputils.h
diff --git a/talk/app/webrtc/sctputils.h b/talk/app/webrtc/sctputils.h
index f16873c4c3d66d59a56b65f60890e125b64d690c..ab1818bcf8ddf6d39263deed07d69b0cc4b4906a 100644
--- a/talk/app/webrtc/sctputils.h
+++ b/talk/app/webrtc/sctputils.h
@@ -39,9 +39,6 @@
 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);