Revert "Add back "default address family" to HostResolver"

net/dns/mapped_host_resolver.cc

 // Copyright (c) 2012 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/mapped_host_resolver.h"
 
 #include <utility>
 
 #include "base/strings/string_util.h"
 #include "base/values.h"
@@ skipping 38 matching lines @@
 }
 
 HostCache* MappedHostResolver::GetHostCache() {
   return impl_->GetHostCache();
 }
 
 std::unique_ptr<base::Value> MappedHostResolver::GetDnsConfigAsValue() const {
   return impl_->GetDnsConfigAsValue();
 }
 
-void MappedHostResolver::SetDefaultAddressFamily(AddressFamily address_family) {
-  impl_->SetDefaultAddressFamily(address_family);
-}
-
-AddressFamily MappedHostResolver::GetDefaultAddressFamily() const {
-  return impl_->GetDefaultAddressFamily();
-}
-
 void MappedHostResolver::SetNoIPv6OnWifi(bool no_ipv6_on_wifi) {
   impl_->SetNoIPv6OnWifi(no_ipv6_on_wifi);
 }
 
 bool MappedHostResolver::GetNoIPv6OnWifi() {
   return impl_->GetNoIPv6OnWifi();
 }
 
 int MappedHostResolver::ApplyRules(RequestInfo* info) const {
   HostPortPair host_port(info->host_port_pair());
   if (rules_.RewriteHost(&host_port)) {
     if (host_port.host() == "~NOTFOUND")
       return ERR_NAME_NOT_RESOLVED;
     info->set_host_port_pair(host_port);
   }
   return OK;
 }
 
 }  // namespace net