Revert "Migrate the IndexedDB backend from Blink to Chromium"

content/browser/indexed_db/indexed_db_cursor.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_INDEXED_DB_CURSOR_H_
-#define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_CURSOR_H_
-
-#include "base/memory/ref_counted.h"
-#include "content/common/indexed_db/indexed_db_key.h"
-
-namespace content {
-
-class IndexedDBCallbacksWrapper;
-
-class IndexedDBCursor : public base::RefCounted<IndexedDBCursor> {
- public:
-  virtual void Advance(unsigned long count,
-                       scoped_refptr<IndexedDBCallbacksWrapper> callbacks) = 0;
-  virtual void ContinueFunction(
-      scoped_ptr<IndexedDBKey> key,
-      scoped_refptr<IndexedDBCallbacksWrapper> callbacks) = 0;
-  virtual void DeleteFunction(
-      scoped_refptr<IndexedDBCallbacksWrapper> callbacks) = 0;
-  virtual void PrefetchContinue(
-      int number_to_fetch,
-      scoped_refptr<IndexedDBCallbacksWrapper> callbacks) = 0;
-  virtual void PrefetchReset(int used_prefetches, int unused_prefetches) = 0;
-  virtual void PostSuccessHandlerCallback() = 0;
-
- protected:
-  virtual ~IndexedDBCursor() {}
-  friend class base::RefCounted<IndexedDBCursor>;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_CURSOR_H_