chromium/chrome/browser/downgrade/downgrade_manager.h

// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_DOWNGRADE_DOWNGRADE_MANAGER_H_
#define CHROME_BROWSER_DOWNGRADE_DOWNGRADE_MANAGER_H_

namespace base {
class FilePath;
class Version;
}  // namespace base

namespace downgrade {

// An encapsulation of processing relating to the handling of browser launches
// where the User Data directory was last written by a higher version of the
// browser (a "downgrade"). It can detect if downgrade processing is needed,
// drop a breadcrumb for future launches indicating the current browser version,
// delete leftover state from a previous downgrade, and perform processing on
// state deposited on the device by the browser (e.g., the User Data directory)
// following a downgrade.
class DowngradeManager { … };

}  // namespace downgrade

#endif  // CHROME_BROWSER_DOWNGRADE_DOWNGRADE_MANAGER_H_