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

sync/syncable/directory.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_DIRECTORY_H_
 #define SYNC_SYNCABLE_DIRECTORY_H_
 #pragma once
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/file_util.h"
 #include "base/gtest_prod_util.h"
 #include "sync/internal_api/public/util/report_unrecoverable_error_function.h"
 #include "sync/internal_api/public/util/weak_handle.h"
 #include "sync/syncable/dir_open_result.h"
 #include "sync/syncable/entry_kernel.h"
 #include "sync/syncable/metahandle_set.h"
 #include "sync/syncable/scoped_kernel_lock.h"
 #include "sync/util/cryptographer.h"
 
 namespace syncer {
+
 class Encryptor;
 class UnrecoverableErrorHandler;
-}
 
 namespace syncable {
 
 class DirectoryChangeDelegate;
 class TransactionObserver;
 class BaseTransaction;
 class WriteTransaction;
 class ScopedKernelLock;
 class DirectoryBackingStore;
 class IdFilter;
@@ skipping 573 matching lines @@
 
   syncer::UnrecoverableErrorHandler* const unrecoverable_error_handler_;
   const syncer::ReportUnrecoverableErrorFunction
       report_unrecoverable_error_function_;
   bool unrecoverable_error_set_;
 
   InvariantCheckLevel invariant_check_level_;
 };
 
 }  // namespace syncable
+}  // namespace syncer
 
 #endif // SYNC_SYNCABLE_DIRECTORY_H_