Add P2PDatagramSocket and P2PStreamSocket interfaces.

remoting/protocol/message_reader.cc

Index: remoting/protocol/message_reader.cc
diff --git a/remoting/protocol/message_reader.cc b/remoting/protocol/message_reader.cc
index 193889115761d25b0880b42b5ba71c3c70579d5c..ab812daf9859ba04de95b8c24a3273f580b5e084 100644
--- a/remoting/protocol/message_reader.cc
+++ b/remoting/protocol/message_reader.cc
@@ -12,9 +12,9 @@
 #include "base/single_thread_task_runner.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
-#include "net/socket/socket.h"
 #include "remoting/base/compound_buffer.h"
 #include "remoting/proto/internal.pb.h"
+#include "remoting/protocol/p2p_stream_socket.h"
 
 namespace remoting {
 namespace protocol {
@@ -39,7 +39,7 @@ void MessageReader::SetMessageReceivedCallback(
 }
 
 void MessageReader::StartReading(
-    net::Socket* socket,
+    P2PStreamSocket* socket,
     const ReadFailedCallback& read_failed_callback) {
   DCHECK(CalledOnValidThread());
   DCHECK(socket);