IndexedDB: Fix cursor prefetching edge cases

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 <string>
 
 #include "base/basictypes.h"
@@ skipping 35 matching lines @@
                                 scoped_ptr<IndexedDBKey> primary_key,
                                 scoped_refptr<IndexedDBCallbacks> callbacks,
                                 IndexedDBTransaction* transaction);
   void CursorAdvanceOperation(uint32 count,
                               scoped_refptr<IndexedDBCallbacks> callbacks,
                               IndexedDBTransaction* transaction);
   void CursorPrefetchIterationOperation(
       int number_to_fetch,
       scoped_refptr<IndexedDBCallbacks> callbacks,
       IndexedDBTransaction* transaction);
+  void CursorPrefetchResetOperation(int used_prefetches,
+                                    IndexedDBTransaction* transaction);
 
  private:
   friend class base::RefCounted<IndexedDBCursor>;
 
   ~IndexedDBCursor();
 
   IndexedDBDatabase::TaskType task_type_;
   indexed_db::CursorType cursor_type_;
   const scoped_refptr<IndexedDBTransaction> transaction_;
 
   // Must be destroyed before transaction_.
   scoped_ptr<IndexedDBBackingStore::Cursor> cursor_;
   // Must be destroyed before transaction_.
   scoped_ptr<IndexedDBBackingStore::Cursor> saved_cursor_;
 
   bool closed_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_CURSOR_H_