Deprecate NonThreadSafe in components/safe_browsing_db in favor of SequenceChecker.

components/safe_browsing_db/v4_get_hash_protocol_manager.h

Index: components/safe_browsing_db/v4_get_hash_protocol_manager.h
diff --git a/components/safe_browsing_db/v4_get_hash_protocol_manager.h b/components/safe_browsing_db/v4_get_hash_protocol_manager.h
index 7d9c2c2aff17e9a3ef47812e0c1446ea7695b15d..6e43e8897c968c9347d607b98eadf01ff7b2f9c9 100644
--- a/components/safe_browsing_db/v4_get_hash_protocol_manager.h
+++ b/components/safe_browsing_db/v4_get_hash_protocol_manager.h
@@ -20,7 +20,7 @@
 
 #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/default_clock.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
@@ -139,8 +139,7 @@ struct FullHashCallbackInfo {
 
 class V4GetHashProtocolManagerFactory;
 
-class V4GetHashProtocolManager : public net::URLFetcherDelegate,
-                                 public base::NonThreadSafe {
+class V4GetHashProtocolManager : public net::URLFetcherDelegate {
  public:
   // Invoked when GetFullHashesWithApis completes.
   // Parameters:
@@ -341,6 +340,8 @@ class V4GetHashProtocolManager : public net::URLFetcherDelegate,
   std::vector<ThreatEntryType> threat_entry_types_;
   std::vector<ThreatType> threat_types_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(V4GetHashProtocolManager);
 };