Add DefaultListenSocket.

net/base/listen_socket.h

Index: net/base/listen_socket.h
diff --git a/net/base/listen_socket.h b/net/base/listen_socket.h
index cd7b6af584e7d8454c6d75c333714cac6bfe0dea..639f25e04805b10f0e9b520b05b138ab4b7b8991 100644
--- a/net/base/listen_socket.h
+++ b/net/base/listen_socket.h
@@ -31,12 +31,12 @@ class NET_EXPORT ListenSocket
     // 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,
+    virtual void DidAccept(ListenSocket* server,
+                           ListenSocket* connection) = 0;
+    virtual void DidRead(ListenSocket* connection,
                          const char* data,
                          int len) = 0;
-    virtual void DidClose(ListenSocket *sock) = 0;
+    virtual void DidClose(ListenSocket* sock) = 0;
   };
 
   // Send data to the socket.
@@ -52,12 +52,12 @@ class NET_EXPORT ListenSocket
  protected:
   friend class base::RefCountedThreadSafe<ListenSocket>;
 
-  ListenSocket(ListenSocketDelegate *del) : socket_delegate_(del) {}
-  virtual ~ListenSocket() {}
+  ListenSocket(ListenSocketDelegate* del);
+  virtual ~ListenSocket();
 
   virtual void SendInternal(const char* bytes, int len) = 0;
 
-  ListenSocketDelegate *socket_delegate_;
+  ListenSocketDelegate* const socket_delegate_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ListenSocket);