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

net/dns/dns_config_service.h

Index: net/dns/dns_config_service.h
diff --git a/net/dns/dns_config_service.h b/net/dns/dns_config_service.h
index e0fd54a6f3bd490c0b3ae85e133dc50bec5fe8a5..2efc1f201b40e6911ff841b83606c0bd804c4e19 100644
--- a/net/dns/dns_config_service.h
+++ b/net/dns/dns_config_service.h
@@ -12,7 +12,7 @@
 
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 // Needed on shared build with MSVS2010 to avoid multiple definitions of
@@ -92,8 +92,7 @@ struct NET_EXPORT_PRIVATE DnsConfig {
 
 // Service for reading system DNS settings, on demand or when signalled by
 // internal watchers and NetworkChangeNotifier.
-class NET_EXPORT_PRIVATE DnsConfigService
-    : NON_EXPORTED_BASE(public base::NonThreadSafe) {
+class NET_EXPORT_PRIVATE DnsConfigService {
  public:
   // Callback interface for the client, called on the same thread as
   // ReadConfig() and WatchConfig().
@@ -174,6 +173,8 @@ class NET_EXPORT_PRIVATE DnsConfigService
   // Started in Invalidate*, cleared in On*Read.
   base::OneShotTimer timer_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(DnsConfigService);
 };