[Sync] Rename csync namespace to syncer

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 CHROME_BROWSER_SYNC_ENGINE_TRAFFIC_LOGGER_H_
 #define CHROME_BROWSER_SYNC_ENGINE_TRAFFIC_LOGGER_H_
 #pragma once
 
 namespace sync_pb {
 class ClientToServerResponse;
 class ClientToServerMessage;
 }  // namespace sync_pb
 
-namespace csync {
+namespace syncer {
 
 void LogClientToServerMessage(const sync_pb::ClientToServerMessage& msg);
 void LogClientToServerResponse(
     const sync_pb::ClientToServerResponse& response);
 
-}  // namespace csync
+}  // namespace syncer
 
 #endif  // CHROME_BROWSER_SYNC_ENGINE_TRAFFIC_LOGGER_H_