AsyncHostResolver: integrated HostCache, temporarily, until we have RR cache.

net/base/host_resolver_impl.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/base/host_resolver_impl.h"
 
 #if defined(OS_WIN)
 #include <Winsock2.h>
 #elif defined(OS_POSIX)
 #include <netdb.h>
@@ skipping 26 matching lines @@
 #include "net/base/net_util.h"
 
 #if defined(OS_WIN)
 #include "net/base/winsock_init.h"
 #endif
 
 namespace net {
 
 namespace {
 
-// Helper to create an AddressList that has a particular port. It has an
-// optimization to avoid allocating a new address linked list when the
-// port is already what we want.
-AddressList CreateAddressListUsingPort(const AddressList& src, int port) {
-  if (src.GetPort() == port)
-    return src;
-
-  AddressList out = src;
-  out.SetPort(port);
-  return out;
-}
-
 // Helper to mutate the linked list contained by AddressList to the given
 // port. Note that in general this is dangerous since the AddressList's
 // data might be shared (and you should use AddressList::SetPort).
 //
 // However since we allocated the AddressList ourselves we can safely
 // do this optimization and avoid reallocating the list.
 void MutableSetPort(int port, AddressList* addrlist) {
   struct addrinfo* mutable_head =
       const_cast<struct addrinfo*>(addrlist->head());
   SetPortForAllAddrinfos(mutable_head, port);
@@ skipping 1558 matching lines @@
     additional_resolver_flags_ |= HOST_RESOLVER_LOOPBACK_ONLY;
   } else {
     additional_resolver_flags_ &= ~HOST_RESOLVER_LOOPBACK_ONLY;
   }
 #endif
   AbortAllInProgressJobs();
   // |this| may be deleted inside AbortAllInProgressJobs().
 }
 
 }  // namespace net