Reland r113263 rebased after revert of r113249.

net/disk_cache/in_flight_backend_io.h

 // Copyright (c) 2011 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 NET_DISK_CACHE_IN_FLIGHT_BACKEND_IO_H_
 #define NET_DISK_CACHE_IN_FLIGHT_BACKEND_IO_H_
 #pragma once
 
 #include <list>
 #include <string>
@@ skipping 150 matching lines @@
   void DoomEntriesBetween(const base::Time initial_time,
                           const base::Time end_time,
                           net::OldCompletionCallback* callback);
   void DoomEntriesBetween(const base::Time initial_time,
                           const base::Time end_time,
                           const net::CompletionCallback& callback);
   void DoomEntriesSince(const base::Time initial_time,
                         net::OldCompletionCallback* callback);
   void OpenNextEntry(void** iter, Entry** next_entry,
                      net::OldCompletionCallback* callback);
+  void OpenNextEntry(void** iter, Entry** next_entry,
+                     const net::CompletionCallback& callback);
   void OpenPrevEntry(void** iter, Entry** prev_entry,
                      net::OldCompletionCallback* callback);
   void EndEnumeration(void* iterator);
   void OnExternalCacheHit(const std::string& key);
   void CloseEntryImpl(EntryImpl* entry);
   void DoomEntryImpl(EntryImpl* entry);
   void FlushQueue(net::OldCompletionCallback* callback);
   void RunTask(Task* task, net::OldCompletionCallback* callback);
   void ReadData(EntryImpl* entry, int index, int offset, net::IOBuffer* buf,
                 int buf_len, net::OldCompletionCallback* callback);
@@ skipping 29 matching lines @@
 
   BackendImpl* backend_;
   scoped_refptr<base::MessageLoopProxy> background_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(InFlightBackendIO);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_IN_FLIGHT_BACKEND_IO_H_