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

sync/syncable/in_memory_directory_backing_store.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/syncable/in_memory_directory_backing_store.h"
 
+namespace syncer {
 namespace syncable {
 
 InMemoryDirectoryBackingStore::InMemoryDirectoryBackingStore(
     const std::string& dir_name) : DirectoryBackingStore(dir_name) {
 }
 
 DirOpenResult InMemoryDirectoryBackingStore::Load(
     MetahandlesIndex* entry_bucket,
     Directory::KernelLoadInfo* kernel_load_info) {
   if (!db_->is_open()) {
     if (!db_->OpenInMemory())
       return FAILED_OPEN_DATABASE;
   }
 
   if (!InitializeTables())
     return FAILED_OPEN_DATABASE;
 
   if (!DropDeletedEntries())
     return FAILED_DATABASE_CORRUPT;
   if (!LoadEntries(entry_bucket))
     return FAILED_DATABASE_CORRUPT;
   if (!LoadInfo(kernel_load_info))
     return FAILED_DATABASE_CORRUPT;
 
   return OPENED;
 }
 
 }  // namespace syncable
+}  // namespace syncer