Decouple DevTools from socket implementation.

net/base/stream_listen_socket.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Stream-based listen socket implementation that handles reading and writing
 // to the socket, but does not handle creating the socket nor connecting
 // sockets, which are handled by subclasses on creation and in Accept,
 // respectively.
 
 // StreamListenSocket handles IO asynchronously in the specified MessageLoop.
@@ skipping 129 matching lines @@
   int send_pending_size_;
   bool send_error_;
   net::BackoffEntry send_backoff_;
 
   // Used to continue sending data asynchronously.
   base::OneShotTimer<StreamListenSocket> send_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(StreamListenSocket);
 };
 
+// Abstract factory that must be subclassed for each subclass of
+// StreamListenSocket.
+class NET_EXPORT StreamListenSocketFactory {
+ public:
+  virtual ~StreamListenSocketFactory() {}
+
+  // Returns a new instance of StreamListenSocket or NULL if an error occurred.
+  virtual scoped_refptr<StreamListenSocket> CreateAndListen(
+      StreamListenSocket::Delegate* delegate) const = 0;
+};
+
 }  // namespace net
 
 #endif  // NET_BASE_STREAM_LISTEN_SOCKET_H_