Deprecate NonThreadSafe in components/bookmarks in favor of SequenceChecker.

components/bookmarks/browser/startup_task_runner_service.cc

Index: components/bookmarks/browser/startup_task_runner_service.cc
diff --git a/components/bookmarks/browser/startup_task_runner_service.cc b/components/bookmarks/browser/startup_task_runner_service.cc
index 5b9b74139a6ef4fdb9c40b6ec0011cd7cc5c0445..117bb1bca3277e611d7a29aa40ee1be94f64267a 100644
--- a/components/bookmarks/browser/startup_task_runner_service.cc
+++ b/components/bookmarks/browser/startup_task_runner_service.cc
@@ -17,11 +17,12 @@ StartupTaskRunnerService::StartupTaskRunnerService(
 }
 
 StartupTaskRunnerService::~StartupTaskRunnerService() {
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
 }
 
 scoped_refptr<base::DeferredSequencedTaskRunner>
     StartupTaskRunnerService::GetBookmarkTaskRunner() {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   if (!bookmark_task_runner_) {
     bookmark_task_runner_ =
         new base::DeferredSequencedTaskRunner(io_task_runner_);