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

net/dns/address_sorter_posix.h

Index: net/dns/address_sorter_posix.h
diff --git a/net/dns/address_sorter_posix.h b/net/dns/address_sorter_posix.h
index e370f226003bb5a4f7f5a5f5447770694f03af98..d0b990f1434379fac83ef453cc4f868c952bdb6b 100644
--- a/net/dns/address_sorter_posix.h
+++ b/net/dns/address_sorter_posix.h
@@ -9,7 +9,7 @@
 #include <vector>
 
 #include "base/macros.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "net/base/address_list.h"
 #include "net/base/ip_address.h"
 #include "net/base/net_export.h"
@@ -24,7 +24,6 @@ class ClientSocketFactory;
 // thread-safe and always completes synchronously.
 class NET_EXPORT_PRIVATE AddressSorterPosix
     : public AddressSorter,
-      public base::NonThreadSafe,
       public NetworkChangeNotifier::IPAddressObserver {
  public:
   // Generic policy entry.
@@ -85,6 +84,8 @@ class NET_EXPORT_PRIVATE AddressSorterPosix
   PolicyTable label_table_;
   PolicyTable ipv4_scope_table_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(AddressSorterPosix);
 };