Add P2PDatagramSocket and P2PStreamSocket interfaces.

remoting/protocol/datagram_channel_factory.h

Index: remoting/protocol/datagram_channel_factory.h
diff --git a/remoting/protocol/datagram_channel_factory.h b/remoting/protocol/datagram_channel_factory.h
index ae22dde23e24d2567e39465ff436a5b41bb69822..6cbd30df7af86b8bf8bdda3925001ab2ab875a07 100644
--- a/remoting/protocol/datagram_channel_factory.h
+++ b/remoting/protocol/datagram_channel_factory.h
@@ -9,16 +9,14 @@
 
 #include "base/callback_forward.h"
 
-namespace net {
-class Socket;
-}  // namespace net
-
 namespace remoting {
 namespace protocol {
 
+class P2PDatagramSocket;
+
 class DatagramChannelFactory {
  public:
-  typedef base::Callback<void(scoped_ptr<net::Socket>)>
+  typedef base::Callback<void(scoped_ptr<P2PDatagramSocket>)>
       ChannelCreatedCallback;
 
   DatagramChannelFactory() {}