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 2bef5196114ffaa4e4876cf01368a84314497d04..146e1d1fff1be2f591691815fb159d1f0f6926ce 100644
--- a/net/base/stream_listen_socket.h
+++ b/net/base/stream_listen_socket.h
@@ -147,6 +147,17 @@ class NET_EXPORT StreamListenSocket
   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_