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

components/policy/core/common/schema_registry.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_POLICY_CORE_COMMON_SCHEMA_REGISTRY_H_
 #define COMPONENTS_POLICY_CORE_COMMON_SCHEMA_REGISTRY_H_
 
 #include <set>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "components/policy/core/common/policy_namespace.h"
 #include "components/policy/core/common/schema.h"
 #include "components/policy/core/common/schema_map.h"
 #include "components/policy/policy_export.h"
 
 namespace policy {
 
 class SchemaMap;
 
 // Holds the main reference to the current SchemaMap, and allows a list of
 // observers to get notified whenever it is updated.
 // This object is not thread safe and must be used from the owner's thread,
 // usually UI.
-class POLICY_EXPORT SchemaRegistry : public base::NonThreadSafe {
+class POLICY_EXPORT SchemaRegistry {
  public:
   class POLICY_EXPORT Observer {
    public:
     // Invoked whenever schemas are registered or unregistered.
     // |has_new_schemas| is true if a new component has been registered since
     // the last update; this allows observers to ignore updates when
     // components are unregistered but still get a handle to the current map
     // (e.g. for periodic reloads).
     virtual void OnSchemaRegistryUpdated(bool has_new_schemas) = 0;
 
@@ skipping 52 matching lines @@
  protected:
   void Notify(bool has_new_schemas);
 
   scoped_refptr<SchemaMap> schema_map_;
 
  private:
   base::ObserverList<Observer, true> observers_;
   base::ObserverList<InternalObserver, true> internal_observers_;
   bool domains_ready_[POLICY_DOMAIN_SIZE];
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(SchemaRegistry);
 };
 
 // A registry that combines the maps of other registries.
 class POLICY_EXPORT CombinedSchemaRegistry
     : public SchemaRegistry,
       public SchemaRegistry::Observer,
       public SchemaRegistry::InternalObserver {
  public:
   CombinedSchemaRegistry();
@@ skipping 48 matching lines @@
   void UpdateReadiness();
 
   SchemaRegistry* wrapped_;
 
   DISALLOW_COPY_AND_ASSIGN(ForwardingSchemaRegistry);
 };
 
 }  // namespace policy
 
 #endif  // COMPONENTS_POLICY_CORE_COMMON_SCHEMA_REGISTRY_H_