Rename SyncNotifier->Invalidator and SyncNotifierObserver->InvalidationHandler.

chrome/browser/sync/invalidation_frontend.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 CHROME_BROWSER_SYNC_INVALIDATION_FRONTEND_H_
 #define CHROME_BROWSER_SYNC_INVALIDATION_FRONTEND_H_
 
 #include "sync/notifier/invalidation_util.h"
 
 namespace syncer {
-class SyncNotifierObserver;
+class InvalidationHandler;
 }  // namespace syncer
 
 // Interface for classes that handle invalidation registrations and send out
 // invalidations to register handlers.
 class InvalidationFrontend {
  public:
   // Starts sending notifications to |handler|.  |handler| must not be NULL,
   // and it must not already be registered.
   //
   // Handler registrations are persisted across restarts of sync.
   virtual void RegisterInvalidationHandler(
-      syncer::SyncNotifierObserver* handler) = 0;
+      syncer::InvalidationHandler* handler) = 0;
 
   // Updates the set of ObjectIds associated with |handler|.  |handler| must
   // not be NULL, and must already be registered.  An ID must be registered for
   // at most one handler.
   //
   // Registered IDs are persisted across restarts of sync.
   virtual void UpdateRegisteredInvalidationIds(
-      syncer::SyncNotifierObserver* handler,
+      syncer::InvalidationHandler* handler,
       const syncer::ObjectIdSet& ids) = 0;
 
   // Stops sending notifications to |handler|.  |handler| must not be NULL, and
   // it must already be registered.  Note that this doesn't unregister the IDs
   // associated with |handler|.
   //
   // Handler registrations are persisted across restarts of sync.
   virtual void UnregisterInvalidationHandler(
-      syncer::SyncNotifierObserver* handler) = 0;
+      syncer::InvalidationHandler* handler) = 0;
 
  protected:
   virtual ~InvalidationFrontend() { }
 };
 
 #endif  // CHROME_BROWSER_SYNC_INVALIDATION_FRONTEND_H_