Remove interface probing for IPv6 support from HostResolverImpl

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 "base/strings/string_util.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
@@ skipping 28 matching lines @@
   if (rv != OK)
     return rv;
 
   return impl_->ResolveFromCache(info, addresses, net_log);
 }
 
 void MappedHostResolver::CancelRequest(RequestHandle req) {
   impl_->CancelRequest(req);
 }
 
-void MappedHostResolver::ProbeIPv6Support() {
-  impl_->ProbeIPv6Support();
-}
-
 HostCache* MappedHostResolver::GetHostCache() {
   return impl_->GetHostCache();
 }
 
 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