base::Bind: Convert Socket::Read.

net/socket/socket.h

Index: net/socket/socket.h
diff --git a/net/socket/socket.h b/net/socket/socket.h
index 90185a2c9ab5586e93876d5fa3cc85dd25190a82..c185c44aa30ef9689157769f7e57f25ad634ab30 100644
--- a/net/socket/socket.h
+++ b/net/socket/socket.h
@@ -31,6 +31,8 @@ class NET_EXPORT Socket {
   // callback will not be invoked.
   virtual int Read(IOBuffer* buf, int buf_len,
                    OldCompletionCallback* callback) = 0;
+  virtual int Read(IOBuffer* buf, int buf_len,
+                   const CompletionCallback& callback) = 0;
 
   // Writes data, up to |buf_len| bytes, to the socket.  Note: data may be
   // written partially.  The number of bytes written is returned, or an error