Garbage Collect the Storage directory on next profile start after an extension uninstall.

chrome/browser/extensions/extension_prefs.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_PREFS_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 476 matching lines @@
 
   // The underlying ExtensionSorting.
   ExtensionSorting* extension_sorting() const {
     return extension_sorting_.get();
   }
 
   // Describes the URLs that are able to install extensions. See
   // prefs::kExtensionAllowedInstallSites for more information.
   URLPatternSet GetAllowedInstallSites();
 
+  // Schedules garbage collection of an extension's on-disk data on the next
+  // start of this ExtensionService. Applies only to extensions with isolated
+  // storage.
+  void SetNeedsStorageGarbageCollection(bool value);
+  bool NeedsStorageGarbageCollection();
+
  private:
   friend class ExtensionPrefsUninstallExtension;  // Unit test.
 
   // See the Create methods.
   ExtensionPrefs(PrefService* prefs,
                  const FilePath& root_dir,
                  ExtensionPrefValueMap* extension_pref_value_map,
                  scoped_ptr<TimeProvider> time_provider);
 
   // If |extensions_disabled| is true, extension controlled preferences and
@@ skipping 107 matching lines @@
   scoped_refptr<ContentSettingsStore> content_settings_store_;
 
   scoped_ptr<TimeProvider> time_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionPrefs);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H_