Make P2PTransportChannel inherit from IceTransportInternal.

webrtc/p2p/base/transportchannelimpl.h

Index: webrtc/p2p/base/transportchannelimpl.h
diff --git a/webrtc/p2p/base/transportchannelimpl.h b/webrtc/p2p/base/transportchannelimpl.h
index 7592a3cbc85fe8ea0190ba64538300e202b245ae..f72cb2d1b0825809b38a489f7c602c81b53d2eb3 100644
--- a/webrtc/p2p/base/transportchannelimpl.h
+++ b/webrtc/p2p/base/transportchannelimpl.h
@@ -14,6 +14,7 @@
 #include <string>
 
 #include "webrtc/base/constructormagic.h"
+#include "webrtc/p2p/base/icetransportinternal.h"
 #include "webrtc/p2p/base/transportchannel.h"
 
 namespace webrtc {
@@ -24,12 +25,6 @@ namespace cricket {
 
 class Candidate;
 
-// TODO(pthatcher): Remove this once it's no longer used in
-// remoting/protocol/libjingle_transport_factory.cc
-enum IceProtocolType {
-  ICEPROTO_RFC5245  // Standard RFC 5245 version of ICE.
-};
-
 // Base class for real implementations of TransportChannel.  This includes some
 // methods called only by Transport, which do not need to be exposed to the
 // client.