[Sync] Move //sync to //components/sync.

sync/engine/traffic_logger.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.
-
-// This file has the functions to log all the sync related HTTP communication.
-// To get the log run a debug build of chrome with the flag
-// --vmodule=traffic_logger=1.
-
-#ifndef SYNC_ENGINE_TRAFFIC_LOGGER_H_
-#define SYNC_ENGINE_TRAFFIC_LOGGER_H_
-
-namespace sync_pb {
-class ClientToServerResponse;
-class ClientToServerMessage;
-}  // namespace sync_pb
-
-namespace syncer {
-
-void LogClientToServerMessage(const sync_pb::ClientToServerMessage& msg);
-void LogClientToServerResponse(
-    const sync_pb::ClientToServerResponse& response);
-
-}  // namespace syncer
-
-#endif  // SYNC_ENGINE_TRAFFIC_LOGGER_H_