Revert of Move some sync/notifier to components/invalidation

sync/notifier/unacked_invalidation_set.cc

 // 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.
 
 #include "sync/notifier/unacked_invalidation_set.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "sync/internal_api/public/base/ack_handle.h"
 #include "sync/notifier/object_id_invalidation_map.h"
+#include "sync/notifier/sync_invalidation_listener.h"
 
 namespace {
 
 const char kSourceKey[] = "source";
 const char kNameKey[] = "name";
 const char kInvalidationListKey[] = "invalidation-list";
 
 }  // namespace
 
 namespace syncer {
@@ skipping 174 matching lines @@
   // an UnknownVersion invalidation.  We remove the oldest remaining
   // invalidation to make room for it.
   invalidation::ObjectId id = invalidations_.begin()->object_id();
   invalidations_.erase(*invalidations_.begin());
 
   Invalidation unknown_version = Invalidation::InitUnknownVersion(id);
   invalidations_.insert(unknown_version);
 }
 
 }  // namespace syncer