Deprecate NonThreadSafe in net/ in favor of SequenceChecker/ThreadChecker.

net/dns/host_cache.h

 // 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.
 
 #ifndef NET_DNS_HOST_CACHE_H_
 #define NET_DNS_HOST_CACHE_H_
 
 #include <stddef.h>
 
 #include <functional>
 #include <memory>
 #include <string>
 #include <tuple>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "base/time/time.h"
 #include "net/base/address_family.h"
 #include "net/base/address_list.h"
 #include "net/base/expiring_cache.h"
 #include "net/base/net_export.h"
 #include "net/dns/dns_util.h"
 
 namespace net {
 
 // Cache used by HostResolver to map hostnames to their resolved result.
-class NET_EXPORT HostCache : NON_EXPORTED_BASE(public base::NonThreadSafe) {
+class NET_EXPORT HostCache {
  public:
   struct Key {
     Key(const std::string& hostname, AddressFamily address_family,
         HostResolverFlags host_resolver_flags)
         : hostname(hostname),
           address_family(address_family),
           host_resolver_flags(host_resolver_flags) {}
 
     bool operator<(const Key& other) const {
       // The order of comparisons of |Key| fields is arbitrary, thus
@@ skipping 153 matching lines @@
 
   void EvictOneEntry(base::TimeTicks now);
 
   // Map from hostname (presumably in lowercase canonicalized format) to
   // a resolved result entry.
   EntryMap entries_;
   size_t max_entries_;
   int network_changes_;
   EvictionCallback eviction_callback_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(HostCache);
 };
 
 }  // namespace net
 
 #endif  // NET_DNS_HOST_CACHE_H_