[Sync] Removing duplicated includes between cc and h files.

components/sync/engine_impl/model_type_worker.cc

 // Copyright 2014 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 "components/sync/engine_impl/model_type_worker.h"
 
-#include <stddef.h>
 #include <stdint.h>
 
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/format_macros.h"
 #include "base/guid.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
-#include "components/sync/base/cryptographer.h"
 #include "components/sync/base/time.h"
 #include "components/sync/core/model_type_processor.h"
 #include "components/sync/engine_impl/commit_contribution.h"
 #include "components/sync/engine_impl/non_blocking_type_commit_contribution.h"
 #include "components/sync/engine_impl/worker_entity_tracker.h"
 #include "components/sync/syncable/syncable_util.h"
 
 namespace syncer_v2 {
 
 using syncer::CommitContribution;
@@ skipping 384 matching lines @@
   return entity_ptr;
 }
 
 WorkerEntityTracker* ModelTypeWorker::GetOrCreateEntityTracker(
     const EntityData& data) {
   WorkerEntityTracker* entity = GetEntityTracker(data.client_tag_hash);
   return entity ? entity : CreateEntityTracker(data);
 }
 
 }  // namespace syncer_v2