Revert "Migrate the IndexedDB backend from Blink to Chromium"

content/browser/indexed_db/leveldb/leveldb_write_batch.h

-// Copyright (c) 2013 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 CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_WRITE_BATCH_H_
-#define CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_WRITE_BATCH_H_
-
-#include "base/memory/scoped_ptr.h"
-
-namespace leveldb {
-class WriteBatch;
-}
-
-namespace content {
-
-class LevelDBSlice;
-
-// Wrapper around leveldb::WriteBatch.
-// This class holds a collection of updates to apply atomically to a database.
-class LevelDBWriteBatch {
- public:
-  static scoped_ptr<LevelDBWriteBatch> Create();
-  ~LevelDBWriteBatch();
-
-  void Put(const LevelDBSlice& key, const LevelDBSlice& value);
-  void Remove(const LevelDBSlice& key);  // Add remove operation to the batch.
-  void Clear();
-
- private:
-  friend class LevelDBDatabase;
-  LevelDBWriteBatch();
-
-  scoped_ptr<leveldb::WriteBatch> write_batch_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_WRITE_BATCH_H_