Move sync/notifier to components/invalidation

sync/internal_api/public/base/ack_handler.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 SYNC_NOTIFIER_ACK_HANDLER_H_
-#define SYNC_NOTIFIER_ACK_HANDLER_H_
+#ifndef SYNC_INTERNAL_API_PUBLIC_BASE_ACK_HANDLER_H_
+#define SYNC_INTERNAL_API_PUBLIC_BASE_ACK_HANDLER_H_
 
 #include <vector>
 
 #include "sync/base/sync_export.h"
 
 namespace invalidation {
 class ObjectId;
 }  // namespace invalidation
 
 namespace syncer {
@@ skipping 15 matching lines @@
       const AckHandle& handle) = 0;
 
   // Record the drop of an invalidation identified by |handle|.
   virtual void Drop(
       const invalidation::ObjectId& id,
       const AckHandle& handle) = 0;
 };
 
 }  // namespace syncer
 
-#endif  // SYNC_NOTIFIER_ACK_HANDLER_H_
+#endif  // SYNC_INTERNAL_API_PUBLIC_BASE_ACK_HANDLER_H_