replace OVERRIDE and FINAL with override and final in sync/

sync/tools/null_invalidation_state_tracker.h

 // Copyright (c) 2012 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 SYNC_TOOLS_NULL_INVALIDATION_STATE_TRACKER_H_
 #define SYNC_TOOLS_NULL_INVALIDATION_STATE_TRACKER_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "components/invalidation/invalidation_state_tracker.h"
 
 namespace syncer {
 
 class NullInvalidationStateTracker
     : public base::SupportsWeakPtr<NullInvalidationStateTracker>,
       public InvalidationStateTracker {
  public:
   NullInvalidationStateTracker();
   virtual ~NullInvalidationStateTracker();
 
-  virtual void ClearAndSetNewClientId(const std::string& data) OVERRIDE;
-  virtual std::string GetInvalidatorClientId() const OVERRIDE;
+  virtual void ClearAndSetNewClientId(const std::string& data) override;
+  virtual std::string GetInvalidatorClientId() const override;
 
-  virtual std::string GetBootstrapData() const OVERRIDE;
-  virtual void SetBootstrapData(const std::string& data) OVERRIDE;
+  virtual std::string GetBootstrapData() const override;
+  virtual void SetBootstrapData(const std::string& data) override;
 
   virtual void SetSavedInvalidations(
-      const UnackedInvalidationsMap& states) OVERRIDE;
-  virtual UnackedInvalidationsMap GetSavedInvalidations() const OVERRIDE;
+      const UnackedInvalidationsMap& states) override;
+  virtual UnackedInvalidationsMap GetSavedInvalidations() const override;
 
-  virtual void Clear() OVERRIDE;
+  virtual void Clear() override;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_TOOLS_NULL_INVALIDATION_STATE_TRACKER_H_