Deprecate NonThreadSafe in components/bookmarks in favor of SequenceChecker.

components/bookmarks/browser/startup_task_runner_service.h

Index: components/bookmarks/browser/startup_task_runner_service.h
diff --git a/components/bookmarks/browser/startup_task_runner_service.h b/components/bookmarks/browser/startup_task_runner_service.h
index b39819af135d2a10201a9dd547fb5727df06d0c4..aed0e88f5fdd92e218f9ea91c92e591f97b1f943 100644
--- a/components/bookmarks/browser/startup_task_runner_service.h
+++ b/components/bookmarks/browser/startup_task_runner_service.h
@@ -7,7 +7,7 @@
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "components/keyed_service/core/keyed_service.h"
 
 namespace base {
@@ -18,8 +18,7 @@ class SequencedTaskRunner;
 namespace bookmarks {
 
 // This service manages the startup task runners.
-class StartupTaskRunnerService : public base::NonThreadSafe,
-                                 public KeyedService {
+class StartupTaskRunnerService : public KeyedService {
  public:
   explicit StartupTaskRunnerService(
       const scoped_refptr<base::SequencedTaskRunner>& io_task_runner);
@@ -41,6 +40,8 @@ class StartupTaskRunnerService : public base::NonThreadSafe,
   scoped_refptr<base::SequencedTaskRunner> io_task_runner_;
   scoped_refptr<base::DeferredSequencedTaskRunner> bookmark_task_runner_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(StartupTaskRunnerService);
 };