Rename SyncNotifier->Invalidator and SyncNotifierObserver->InvalidationHandler.

sync/notifier/sync_notifier_observer.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_NOTIFIER_SYNC_NOTIFIER_OBSERVER_H_
-#define SYNC_NOTIFIER_SYNC_NOTIFIER_OBSERVER_H_
-
-#include "sync/notifier/object_id_state_map.h"
-#include "sync/notifier/notifications_disabled_reason.h"
-
-namespace syncer {
-
-enum IncomingNotificationSource {
-  // The server is notifying us that one or more datatypes have stale data.
-  REMOTE_NOTIFICATION,
-  // A chrome datatype is requesting an optimistic refresh of its data.
-  LOCAL_NOTIFICATION,
-};
-
-class SyncNotifierObserver {
- public:
-  // Called when notifications are enabled.
-  virtual void OnNotificationsEnabled() = 0;
-
-  // Called when notifications are disabled, with the reason in
-  // |reason|.
-  virtual void OnNotificationsDisabled(
-      NotificationsDisabledReason reason) = 0;
-
-  // Called when a notification is received.  The per-id states
-  // are in |id_state_map| and the source is in |source|.
-  virtual void OnIncomingNotification(
-      const ObjectIdStateMap& id_state_map,
-      IncomingNotificationSource source) = 0;
-
- protected:
-  virtual ~SyncNotifierObserver() {}
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_NOTIFIER_SYNC_NOTIFIER_OBSERVER_H_