Remove disk_cache::BackendImpl::OpenPrevEntry() and all users.

net/tools/dump_cache/upgrade_win.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.
-
-#include <windows.h>
-
-#include "base/command_line.h"
-#include "base/files/file_path.h"
-#include "base/strings/string16.h"
-
-// Creates a new server, and returns a new named pipe to communicate with it.
-HANDLE CreateServer(base::string16* pipe_number);
-
-// Runs a loop to write a new cache with all the data available from a slave
-// process connected through the provided |pipe|.
-int UpgradeCache(const base::FilePath& output_path, HANDLE pipe);
-
-// This process will only execute commands from the controller.
-int RunSlave(const base::FilePath& input_path,
-             const base::string16& pipe_number);