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

net/dns/mock_host_resolver.h

Index: net/dns/mock_host_resolver.h
diff --git a/net/dns/mock_host_resolver.h b/net/dns/mock_host_resolver.h
index d61002c56e543b5932658bcf3b95073a5786a90d..1d1e66447c261fdfa9c766abb74418d93c60b7fd 100644
--- a/net/dns/mock_host_resolver.h
+++ b/net/dns/mock_host_resolver.h
@@ -13,9 +13,9 @@
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/sequence_checker.h"
 #include "base/synchronization/lock.h"
 #include "base/synchronization/waitable_event.h"
-#include "base/threading/non_thread_safe.h"
 #include "net/dns/host_resolver.h"
 #include "net/dns/host_resolver_proc.h"
 
@@ -56,9 +56,9 @@ int ParseAddressList(const std::string& host_list,
 // 127.0.0.1.
 
 // Base class shared by MockHostResolver and MockCachingHostResolver.
-class MockHostResolverBase : public HostResolver,
-                             public base::SupportsWeakPtr<MockHostResolverBase>,
-                             public base::NonThreadSafe {
+class MockHostResolverBase
+    : public HostResolver,
+      public base::SupportsWeakPtr<MockHostResolverBase> {
  private:
   class RequestImpl;
 
@@ -147,6 +147,8 @@ class MockHostResolverBase : public HostResolver,
   size_t num_resolve_;
   size_t num_resolve_from_cache_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(MockHostResolverBase);
 };