Revert 273763 "Add garbage collection for shared extensions on C..."

trunk/src/chrome/browser/extensions/extension_garbage_collector_chromeos.h

-// Copyright 2014 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_CHROMEOS_H_
-#define CHROME_BROWSER_EXTENSIONS_EXTENSION_GARBAGE_COLLECTOR_CHROMEOS_H_
-
-#include "chrome/browser/extensions/extension_garbage_collector.h"
-
-namespace extensions {
-
-// Chrome OS specific extensions garbage collector. In addition to base class
-// it also cleans up extensions install directory in shared location, see
-// ExtensionAssetsManagerChromeOS.
-class ExtensionGarbageCollectorChromeOS : public ExtensionGarbageCollector {
- public:
-  explicit ExtensionGarbageCollectorChromeOS(content::BrowserContext* context);
-  virtual ~ExtensionGarbageCollectorChromeOS();
-
-  static ExtensionGarbageCollectorChromeOS* Get(
-      content::BrowserContext* context);
-
-  // Enable or disable garbage collection. See |disable_garbage_collection_|.
-  void disable_garbage_collection() { disable_garbage_collection_ = true; }
-  void enable_garbage_collection() { disable_garbage_collection_ = false; }
-
- private:
-  // Overriddes for ExtensionGarbageCollector:
-  virtual void GarbageCollectExtensions() OVERRIDE;
-
-  // Return true if there is no extension installation for all active profiles.
-  bool CanGarbageCollectSharedExtensions();
-
-  // Do GC for shared extensions dir.
-  void GarbageCollectSharedExtensions();
-
-  // TODO(rkc): HACK alert - this is only in place to allow the
-  // kiosk_mode_screensaver to prevent its extension from getting garbage
-  // collected. Remove this once KioskModeScreensaver is removed.
-  // See crbug.com/280363
-  bool disable_garbage_collection_;
-
-  // Shared extensions need to be processed only once but instances of this
-  // class are created per-profile so this static variable prevents multiple
-  // processing.
-  static bool shared_extensions_garbage_collected;
-
-  DISALLOW_COPY_AND_ASSIGN(ExtensionGarbageCollectorChromeOS);
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_GARBAGE_COLLECTOR_CHROMEOS_H_