Decouple DevTools from socket implementation.

net/base/stream_listen_socket.h

Index: net/base/stream_listen_socket.h
diff --git a/net/base/stream_listen_socket.h b/net/base/stream_listen_socket.h
index 8b71b52edf36ba11433bd2eca581e81aa7617be9..40d8a20d737b5b2ce2758a1e89a304d07d1073bc 100644
--- a/net/base/stream_listen_socket.h
+++ b/net/base/stream_listen_socket.h
@@ -132,6 +132,17 @@ class NET_EXPORT StreamListenSocket
   DISALLOW_COPY_AND_ASSIGN(StreamListenSocket);
 };
 
+// Abstract factory that must be subclassed for each subclass of
+// StreamListenSocket.
+class 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_