Get ride of chrome.storage.* data when removing an application.

chrome/browser/extensions/extension_service.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_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 
 #include <list>
 #include <map>
 #include <set>
@@ skipping 36 matching lines @@
 namespace base {
 class SequencedTaskRunner;
 class Version;
 }
 
 namespace extensions {
 class BrowserEventRouter;
 class ComponentLoader;
 class ContentSettingsStore;
 class CrxInstaller;
+class DataDeleter;
 class ExtensionActionStorageManager;
 class ExtensionRegistry;
 class ExtensionSystem;
 class ExtensionUpdater;
 class PendingExtensionManager;
 class SettingsFrontend;
 class UpdateObserver;
 }  // namespace extensions
 
 namespace syncer {
@@ skipping 788 matching lines @@
   // 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_;
 #endif
 
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsWithUnlimtedStorage);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsAndCheckStorageProtection);
+  friend class extensions::DataDeleter;
   DISALLOW_COPY_AND_ASSIGN(ExtensionService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_