Revert of Delete old files after an update.

chrome/installer/setup/install.cc

 // 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 "chrome/installer/setup/install.h"
 
 #include <windows.h>
 #include <shlobj.h>
 #include <time.h>
 
@@ skipping 535 matching lines @@
       RegisterChromeOnMachine(installer_state, *chrome_product,
           make_chrome_default || force_chrome_default_for_user);
 
       if (!installer_state.system_install()) {
         DCHECK_EQ(chrome_product->distribution(),
                   BrowserDistribution::GetDistribution());
         UpdateDefaultBrowserBeaconForPath(
             installer_state.target_path().Append(installer::kChromeExe));
       }
     }
+
+    installer_state.UpdateStage(installer::REMOVING_OLD_VERSIONS);
+
+    installer_state.RemoveOldVersionDirectories(
+        new_version,
+        existing_version.get(),
+        install_temp_path);
   }
 
   return result;
 }
 
 void HandleOsUpgradeForBrowser(const installer::InstallerState& installer_state,
                                const installer::Product& chrome,
                                const base::Version& installed_version) {
   DCHECK(chrome.is_chrome());
 
@@ skipping 80 matching lines @@
   // Read master_preferences copied beside chrome.exe at install.
   MasterPreferences prefs(installation_root.AppendASCII(kDefaultMasterPrefs));
   base::FilePath chrome_exe(installation_root.Append(kChromeExe));
   CreateOrUpdateShortcuts(
       chrome_exe, chrome, prefs, CURRENT_USER, install_operation);
 
   UpdateDefaultBrowserBeaconForPath(chrome_exe);
 }
 
 }  // namespace installer