Remove unused HostResolver::Observer.

net/socket/transport_client_socket_pool.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/socket/transport_client_socket_pool.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
@@ skipping 53 matching lines @@
     const GURL& referrer,
     bool disable_resolver_cache,
     bool ignore_limits)
     : destination_(host_port_pair), ignore_limits_(ignore_limits) {
   Initialize(priority, referrer, disable_resolver_cache);
 }
 
 TransportSocketParams::~TransportSocketParams() {}
 
 void TransportSocketParams::Initialize(RequestPriority priority,
                                        const GURL& referrer,

[eroman, 2011/11/15 03:54:01]

Please add a todo to remove |referrer| as it is no longer used.

                                        bool disable_resolver_cache) {
-  // The referrer is used by the DNS prefetch system to correlate resolutions
-  // with the page that triggered them. It doesn't impact the actual addresses
-  // that we resolve to.
-  destination_.set_referrer(referrer);
   destination_.set_priority(priority);
   if (disable_resolver_cache)
     destination_.set_allow_cached_response(false);
 }
 
 // TransportConnectJobs will time out after this many seconds.  Note this is
 // the total time, including both host resolution and TCP connect() times.
 //
 // TODO(eroman): The use of this constant needs to be re-evaluated. The time
 // needed for TCPClientSocketXXX::Connect() can be arbitrarily long, since
@@ skipping 391 matching lines @@
 
 base::TimeDelta TransportClientSocketPool::ConnectionTimeout() const {
   return base_.ConnectionTimeout();
 }
 
 ClientSocketPoolHistograms* TransportClientSocketPool::histograms() const {
   return base_.histograms();
 }
 
 }  // namespace net