Revert 142427 - Cleaning Up Extensions When Local Content Removed

chrome/browser/extensions/extension_garbage_collector.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.
-
-#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_GARBAGE_COLLECTOR_H_
-#define CHROME_BROWSER_EXTENSIONS_EXTENSION_GARBAGE_COLLECTOR_H_
-#pragma once
-
-#include <set>
-
-#include "base/file_path.h"
-
-class ExtensionService;
-
-// Garbage collection for extensions. This will delete any directories in the
-// installation directory of |extension_service_| that aren't valid, as well
-// as removing any references in the preferences to extensions that are
-// missing local content.
-namespace extensions {
-
-class ExtensionGarbageCollector {
- public:
-  explicit ExtensionGarbageCollector(ExtensionService* extension_service);
-  virtual ~ExtensionGarbageCollector();
-
-  // Begin garbage collection; fetch the installed extensions' ids.
-  void GarbageCollectExtensions();
-
- private:
-  // Check the installation directory for directories with invalid extension
-  // ids, deleting them if found. Call CheckExtensionPreferences with a list of
-  // present directories.
-  void CheckExtensionDirectoriesOnBackgroundThread(
-      const FilePath& installation_directory);
-
-  // Check for any extension directories which:
-  //   - Are an old version of a current extension;
-  //   - Are present in the preferences but not on the file system;
-  //   - Are present on the file system, but not in the preferences
-  // and delete them if found.
-  void CheckExtensionPreferences(const std::set<FilePath>& extension_paths);
-
-  // Helper function to cleanup any old versions of an extension in the
-  // extension's base directory.
-  void CleanupOldVersionsOnBackgroundThread(
-      const FilePath& path, const FilePath& current_version);
-
-  ExtensionService* extension_service_;
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_GARBAGE_COLLECTOR_H_