Add Cronet experimental option to disable ipv6

components/cronet/stale_host_resolver.cc

 // Copyright 2016 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 "components/cronet/stale_host_resolver.h"
 
 #include "base/callback_helpers.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/stl_util.h"
 #include "base/timer/timer.h"
 #include "base/values.h"
+#include "net/base/address_family.h"

[xunjieli, 2017/02/28 18:39:59]

can be reverted.

[mgersh, 2017/02/28 18:42:45]

Done.

 #include "net/base/net_errors.h"
 #include "net/dns/dns_util.h"
 #include "net/dns/host_resolver_impl.h"
 
 namespace cronet {
 
 namespace {
 
 // Used in histograms; do not modify existing values.
 enum RequestOutcome {
@@ skipping 368 matching lines @@
 
 net::HostCache* StaleHostResolver::GetHostCache() {
   return inner_resolver_->GetHostCache();
 }
 
 std::unique_ptr<base::Value> StaleHostResolver::GetDnsConfigAsValue() const {
   return inner_resolver_->GetDnsConfigAsValue();
 }
 
 }  // namespace net