Revert of Moving MediaStreamSignaling logic into PeerConnection.

talk/app/webrtc/sctputils.cc

Index: talk/app/webrtc/sctputils.cc
diff --git a/talk/app/webrtc/sctputils.cc b/talk/app/webrtc/sctputils.cc
index 22395995116c5de4e01ba8b85c61906ce3f12e18..a64383720f85a3d86a25ef80fdba1defa51bc8f3 100644
--- a/talk/app/webrtc/sctputils.cc
+++ b/talk/app/webrtc/sctputils.cc
@@ -47,19 +47,6 @@
   DCOMCT_UNORDERED_PARTIAL_RTXS = 0x81,
   DCOMCT_UNORDERED_PARTIAL_TIME = 0x82,
 };
-
-bool IsOpenMessage(const rtc::Buffer& payload) {
-  // Format defined at
-  // http://tools.ietf.org/html/draft-jesup-rtcweb-data-protocol-04
-
-  rtc::ByteBuffer buffer(payload);
-  uint8_t message_type;
-  if (!buffer.ReadUInt8(&message_type)) {
-    LOG(LS_WARNING) << "Could not read OPEN message type.";
-    return false;
-  }
-  return message_type == DATA_CHANNEL_OPEN_MESSAGE_TYPE;
-}
 
 bool ParseDataChannelOpenMessage(const rtc::Buffer& payload,
                                  std::string* label,