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

sync/syncable/base_transaction.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_BASE_TRANSACTION_H_
 #define SYNC_SYNCABLE_BASE_TRANSACTION_H_
 #pragma once
 
 #include "base/location.h"
 #include "sync/syncable/syncable_id.h"
 
+namespace syncer {
 namespace syncable {
 
 class Directory;
 
 // A WriteTransaction has a writer tag describing which body of code is doing
 // the write. This is defined up here since WriteTransactionInfo also contains
 // one.
 enum WriterTag {
   INVALID,
   SYNCER,
@@ skipping 47 matching lines @@
   // Error information.
   bool unrecoverable_error_set_;
   tracked_objects::Location unrecoverable_error_location_;
   std::string unrecoverable_error_msg_;
 
  private:
   friend class Entry;
   DISALLOW_COPY_AND_ASSIGN(BaseTransaction);
 };
 
-}
+}  // namespace syncable
+}  // namespace syncer
 
 #endif  // SYNC_SYNCABLE_BASE_TRANSACTION_H_