[Sync] Move sync/{internal_api,syncable} into syncer namespace

sync/syncable/syncable_enum_conversions.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.
 
 #ifndef SYNC_SYNCABLE_SYNCABLE_ENUM_CONVERSIONS_H_
 #define SYNC_SYNCABLE_SYNCABLE_ENUM_CONVERSIONS_H_
 #pragma once
 
 // Keep this file in sync with entry_kernel.h.
 
 #include "sync/syncable/entry_kernel.h"
 
 // Utility functions to get the string equivalent for some syncable
 // enums.
 
+namespace syncer {
 namespace syncable {
 
 // The returned strings (which don't have to be freed) are in ASCII.
 // The result of passing in an invalid enum value is undefined.
 
 const char* GetMetahandleFieldString(MetahandleField metahandle_field);
 
 const char* GetBaseVersionString(BaseVersion base_version);
 
 const char* GetInt64FieldString(Int64Field int64_field);
 
 const char* GetTimeFieldString(TimeField time_field);
 
 const char* GetIdFieldString(IdField id_field);
 
 const char* GetIndexedBitFieldString(IndexedBitField indexed_bit_field);
 
 const char* GetIsDelFieldString(IsDelField is_del_field);
 
 const char* GetBitFieldString(BitField bit_field);
 
 const char* GetStringFieldString(StringField string_field);
 
 const char* GetProtoFieldString(ProtoField proto_field);
 
 const char* GetBitTempString(BitTemp bit_temp);
 
 }  // namespace syncable
+}  // namespace syncer
 
 #endif  // SYNC_SYNCABLE_SYNCABLE_ENUM_CONVERSIONS_H_