Support --delete-old-versions in setup.exe.

chrome/installer/setup/install.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.
 //
 // This file contains the specification of setup main functions.
 
 #ifndef CHROME_INSTALLER_SETUP_INSTALL_H_
 #define CHROME_INSTALLER_SETUP_INSTALL_H_
 
 #include <vector>
@@ skipping 111 matching lines @@
     const InstallationState& original_state,
     const InstallerState& installer_state,
     const base::FilePath& setup_path,
     const base::FilePath& archive_path,
     const base::FilePath& install_temp_path,
     const base::FilePath& src_path,
     const base::FilePath& prefs_path,
     const installer::MasterPreferences& prefs,
     const base::Version& new_version);
 
+// Launches a process that deletes files that belong to old versions of Chrome.
+void LaunchDeleteOldVersionsProcess(const InstallerState& installer_state);
+
 // Performs installation-related tasks following an OS upgrade.
 // |chrome| The installed product (must be a browser).
 // |installed_version| the current version of this install.
 void HandleOsUpgradeForBrowser(const InstallerState& installer_state,
                                const Product& chrome,
                                const base::Version& installed_version);
 
 // Performs per-user installation-related tasks on Active Setup (ran on first
 // login for each user post system-level Chrome install).
 // |installation_root|: The root of this install (i.e. the directory in which
 // chrome.exe is installed).
 // Shortcut creation is skipped if the First Run beacon is present (unless
 // |force| is set to true).
 // |chrome| The installed product (must be a browser).
 void HandleActiveSetupForBrowser(const base::FilePath& installation_root,
                                  const Product& chrome,
                                  bool force);
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_SETUP_INSTALL_H_