Replace deprecated base::NonThreadSafe in components/keyed_service in favor of SequenceChecker.

components/keyed_service/core/keyed_service_base_factory.h

Index: components/keyed_service/core/keyed_service_base_factory.h
diff --git a/components/keyed_service/core/keyed_service_base_factory.h b/components/keyed_service/core/keyed_service_base_factory.h
index ea9223b0af3fda00ff0b544e253b4eb98b62584d..94d01d77c7bc021f86c2e96606d120b212a8adae 100644
--- a/components/keyed_service/core/keyed_service_base_factory.h
+++ b/components/keyed_service/core/keyed_service_base_factory.h
@@ -7,7 +7,7 @@
 
 #include <set>
 
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "components/keyed_service/core/dependency_node.h"
 #include "components/keyed_service/core/keyed_service_export.h"
 
@@ -29,8 +29,7 @@ class PrefRegistrySyncable;
 // This object describes general dependency management between factories while
 // direct subclasses react to lifecycle events and implement memory management.
 class KEYED_SERVICE_EXPORT KeyedServiceBaseFactory
-    : public base::NonThreadSafe,
-      NON_EXPORTED_BASE(public DependencyNode) {
+    : NON_EXPORTED_BASE(public DependencyNode) {
  public:
 #ifndef NDEBUG
   // Returns our name. We don't keep track of this in release mode.
@@ -112,6 +111,8 @@ class KEYED_SERVICE_EXPORT KeyedServiceBaseFactory
   // Mark context has having preferences registered.
   void MarkPreferencesSetOn(base::SupportsUserData* context);
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
  private:
   friend class DependencyManager;