Deprecate NonThreadSafe in components/captive_portal in favor of SequenceChecker.

components/captive_portal/captive_portal_detector.h

Index: components/captive_portal/captive_portal_detector.h
diff --git a/components/captive_portal/captive_portal_detector.h b/components/captive_portal/captive_portal_detector.h
index e25cd443f4e3ba1ac64412349c4872b8fca251ad..b5a26331cf2f033b6c705b7439e15b81ed60e60d 100644
--- a/components/captive_portal/captive_portal_detector.h
+++ b/components/captive_portal/captive_portal_detector.h
@@ -11,7 +11,7 @@
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "base/time/time.h"
 #include "components/captive_portal/captive_portal_export.h"
 #include "components/captive_portal/captive_portal_types.h"
@@ -25,8 +25,7 @@ class GURL;
 namespace captive_portal {
 
 class CAPTIVE_PORTAL_EXPORT CaptivePortalDetector
-    : public net::URLFetcherDelegate,
-      public base::NonThreadSafe {
+    : public net::URLFetcherDelegate {
  public:
   struct Results {
     Results()
@@ -104,6 +103,8 @@ class CAPTIVE_PORTAL_EXPORT CaptivePortalDetector
   // Test time used by unit tests.
   base::Time time_for_testing_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(CaptivePortalDetector);
 };