[Sync] Rename csync namespace to syncer

sync/internal_api/public/util/syncer_error.cc

 // 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.
 
 #include "sync/internal_api/public/util/syncer_error.h"
 
 #include "base/logging.h"
 
-namespace csync {
+namespace syncer {
 
 #define ENUM_CASE(x) case x: return #x; break;
 const char* GetSyncerErrorString(SyncerError value) {
   switch (value) {
     ENUM_CASE(UNSET);
     ENUM_CASE(DIRECTORY_LOOKUP_FAILED);
     ENUM_CASE(NETWORK_CONNECTION_UNAVAILABLE);
     ENUM_CASE(NETWORK_IO_ERROR);
     ENUM_CASE(SYNC_SERVER_ERROR);
     ENUM_CASE(SYNC_AUTH_ERROR);
     ENUM_CASE(SERVER_RETURN_INVALID_CREDENTIAL);
     ENUM_CASE(SERVER_RETURN_UNKNOWN_ERROR);
     ENUM_CASE(SERVER_RETURN_THROTTLED);
     ENUM_CASE(SERVER_RETURN_TRANSIENT_ERROR);
     ENUM_CASE(SERVER_RETURN_MIGRATION_DONE);
     ENUM_CASE(SERVER_RETURN_CLEAR_PENDING);
     ENUM_CASE(SERVER_RETURN_NOT_MY_BIRTHDAY);
     ENUM_CASE(SERVER_RESPONSE_VALIDATION_FAILED);
     ENUM_CASE(SYNCER_OK);
   }
   NOTREACHED();
   return "INVALID";
 }
 #undef ENUM_CASE
 
-} // namespace csync
-
+}  // namespace syncer