Revert of [Sync] IWYU cleanup.

components/sync/engine_impl/loopback_server/persistent_bookmark_entity.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/loopback_server/persistent_bookmark_entity.h"
 
+#include <stdint.h>
+
+#include <memory>
+#include <string>
+
 #include "base/guid.h"
+#include "components/sync/base/model_type.h"
+#include "components/sync/engine_impl/loopback_server/loopback_server_entity.h"
+#include "components/sync/protocol/sync.pb.h"
 
 using std::string;
 
 namespace syncer {
 
 namespace {
 
 // Returns true if and only if |client_entity| is a bookmark.
 bool IsBookmark(const sync_pb::SyncEntity& client_entity) {
   return syncer::GetModelType(client_entity) == syncer::BOOKMARKS;
@@ skipping 114 matching lines @@
 
   sync_pb::UniquePosition* unique_position = proto->mutable_unique_position();
   unique_position->CopyFrom(unique_position_);
 }
 
 bool PersistentBookmarkEntity::IsFolder() const {
   return is_folder_;
 }
 
 }  // namespace syncer