Revert 113282 - Isolates generic DnsClient from AsyncHostResolver.

net/dns/dns_session.cc

-// 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.
-
-#include "net/dns/dns_session.h"
-
-#include "base/basictypes.h"
-#include "base/bind.h"
-#include "base/time.h"
-#include "net/base/ip_endpoint.h"
-#include "net/dns/dns_config_service.h"
-#include "net/socket/client_socket_factory.h"
-
-namespace net {
-
-DnsSession::DnsSession(const DnsConfig& config,
-                       ClientSocketFactory* factory,
-                       const RandIntCallback& rand_int_callback,
-                       NetLog* net_log)
-    : config_(config),
-      socket_factory_(factory),
-      rand_callback_(base::Bind(rand_int_callback, 0, kuint16max)),
-      net_log_(net_log),
-      server_index_(0) {
-}
-
-int DnsSession::NextId() const {
-  return rand_callback_.Run();
-}
-
-const IPEndPoint& DnsSession::NextServer() {
-  // TODO(szym): Rotate servers on failures.
-  const IPEndPoint& ipe = config_.nameservers[server_index_];
-  if (config_.rotate)
-    server_index_ = (server_index_ + 1) % config_.nameservers.size();
-  return ipe;
-}
-
-base::TimeDelta DnsSession::NextTimeout(int attempt) {
-  // TODO(szym): Adapt timeout to observed RTT.
-  return config_.timeout * (attempt + 1);
-}
-
-DnsSession::~DnsSession() {}
-
-}  // namespace net
-