Rename InvalidationVersionTracker to InvalidationStateTracker in preparation

sync/notifier/invalidation_version_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.
-//
-// An InvalidationVersionTracker is an interface that handles getting
-// and setting (persisting) max invalidation versions.
-
-#ifndef SYNC_NOTIFIER_INVALIDATION_VERSION_TRACKER_H_
-#define SYNC_NOTIFIER_INVALIDATION_VERSION_TRACKER_H_
-
-#include <map>
-
-#include "base/basictypes.h"
-#include "sync/syncable/model_type.h"
-
-namespace sync_notifier {
-
-typedef std::map<syncable::ModelType, int64> InvalidationVersionMap;
-
-class InvalidationVersionTracker {
- public:
-  InvalidationVersionTracker() {}
-
-  virtual InvalidationVersionMap GetAllMaxVersions() const = 0;
-
-  // |max_version| should be strictly greater than any existing max
-  // version for |model_type|.
-  virtual void SetMaxVersion(syncable::ModelType model_type,
-                             int64 max_version) = 0;
-
- protected:
-  virtual ~InvalidationVersionTracker() {}
-};
-
-}  // namespace sync_notifier
-
-#endif  // SYNC_NOTIFIER_INVALIDATION_VERSION_TRACKER_H_
-