Remove SnowflakeDataChannel interface.

Use *webrtc.DataChannel directly.

client/lib/interfaces.go

@@ -1,7 +1,6 @@
 package lib
 
 import (
-	"io"
 	"net"
 )
 
@@ -30,9 +29,3 @@ type SocksConnector interface {
 	Reject() error
 	net.Conn
 }
-
-// Interface for the Snowflake's transport. (Typically just webrtc.DataChannel)
-type SnowflakeDataChannel interface {
-	io.Closer
-	Send([]byte) error
-}

client/lib/webrtc.go

@@ -21,7 +21,7 @@ type WebRTCPeer struct {
 	id        string
 	config    *webrtc.Configuration
 	pc        *webrtc.PeerConnection
-	transport SnowflakeDataChannel // Holds the WebRTC DataChannel.
+	transport *webrtc.DataChannel
 	broker    *BrokerChannel
 
 	offerChannel  chan *webrtc.SessionDescription
@@ -321,7 +321,7 @@ func (c *WebRTCPeer) cleanup() {
 		if c.pc == nil {
 			panic("DataChannel w/o PeerConnection, not good.")
 		}
-		dataChannel.(*webrtc.DataChannel).Close()
+		dataChannel.Close()
 	} else {
 		c.lock.Unlock()
 	}