Revert 87809 - Added DnsQuery class

net/base/dns_response.h

-// Copyright (c) 2011 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.
-
-#ifndef NET_BASE_DNS_RESPONSE_H_
-#define NET_BASE_DNS_RESPONSE_H_
-#pragma once
-
-#include "net/base/dns_query.h"
-
-namespace net{
-
-class AddressList;
-
-// A class that encapsulates bits and pieces related to DNS response
-// processing.
-class DnsResponse {
- public:
-  // Constructs an object with an IOBuffer large enough to read
-  // one byte more than largest possible response, to detect malformed
-  // responses; |query| is a pointer to the DnsQuery for which |this|
-  // is supposed to be a response.
-  explicit DnsResponse(DnsQuery* query);
-
-  // Internal buffer accessor into which actual bytes of response will be
-  // read.
-  IOBufferWithSize* io_buffer() { return io_buffer_.get(); }
-
-  // Parses response of size nbytes and puts address into |results|,
-  // returns net_error code in case of failure.
-  int Parse(int nbytes, AddressList* results);
-
- private:
-  // The matching query; |this| is the response for |query_|.  We do not
-  // own it, lifetime of |this| should be within the limits of lifetime of
-  // |query_|.
-  const DnsQuery* const query_;
-
-  // Buffer into which response bytes are read.
-  scoped_refptr<IOBufferWithSize> io_buffer_;
-
-  DISALLOW_COPY_AND_ASSIGN(DnsResponse);
-};
-
-}  // namespace net
-
-#endif  // NET_BASE_DNS_RESPONSE_H_