Brushed up listen socket:

net/base/listen_socket.h

 // Copyright (c) 2006-2008 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.
 
 // TCP/IP server that handles IO asynchronously in the specified MessageLoop.
 // These objects are NOT thread safe.  They use WSAEVENT handles to monitor
 // activity in a given MessageLoop.  This means that callbacks will
 // happen in that loop's thread always and that all other methods (including
 // constructors and destructors) should also be called from the same thread.
 
@@ skipping 33 matching lines @@
   // to split up the listener from the connected socket.  Perhaps this class
   // should be split up similarly.
   class ListenSocketDelegate {
    public:
     virtual ~ListenSocketDelegate() {}
 
     // server is the original listening Socket, connection is the new
     // Socket that was created.  Ownership of connection is transferred
     // to the delegate with this call.
     virtual void DidAccept(ListenSocket *server, ListenSocket *connection) = 0;
-    virtual void DidRead(ListenSocket *connection, const std::string& data) = 0;
+    virtual void DidRead(ListenSocket *connection,
+                         const char* data,
+                         int len) = 0;
     virtual void DidClose(ListenSocket *sock) = 0;
   };
 
   // Listen on port for the specified IP address.  Use 127.0.0.1 to only
   // accept local connections.
   static ListenSocket* Listen(std::string ip, int port,
                               ListenSocketDelegate* del);
 
   // Send data to the socket.
   void Send(const char* bytes, int len, bool append_linefeed = false);
@@ skipping 54 matching lines @@
   ListenSocketDelegate *socket_delegate_;
 
  private:
   bool reads_paused_;
   bool has_pending_reads_;
 
   DISALLOW_COPY_AND_ASSIGN(ListenSocket);
 };
 
 #endif  // NET_BASE_LISTEN_SOCKET_H_