AppCaches which belong to hosted apps are not protected from deletion

content/browser/appcache/chrome_appcache_service.h

 // Copyright (c) 2011 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 CONTENT_BROWSER_APPCACHE_CHROME_APPCACHE_SERVICE_H_
 #define CONTENT_BROWSER_APPCACHE_CHROME_APPCACHE_SERVICE_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "content/browser/browser_thread.h"
@@ skipping 22 matching lines @@
                                         BrowserThread::DeleteOnIOThread>,
       public appcache::AppCacheService,
       public appcache::AppCachePolicy,
       public NotificationObserver {
  public:
   explicit ChromeAppCacheService(quota::QuotaManagerProxy* proxy);
 
   void InitializeOnIOThread(
       const FilePath& cache_path,  // may be empty to use in-memory structures
       const content::ResourceContext* resource_context,
-      scoped_refptr<quota::SpecialStoragePolicy> special_storage_policy,
-      bool clear_local_state_on_exit);
-
-  void SetClearLocalStateOnExit(bool clear_local_state);
+      scoped_refptr<quota::SpecialStoragePolicy> special_storage_policy);
 
  private:
   friend class BrowserThread;
   friend class DeleteTask<ChromeAppCacheService>;
 
   virtual ~ChromeAppCacheService();
 
   // AppCachePolicy overrides
   virtual bool CanLoadAppCache(const GURL& manifest_url);
   virtual int CanCreateAppCache(const GURL& manifest_url,
                                 net::CompletionCallback* callback);
 
   // NotificationObserver override
   virtual void Observe(int type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
   const content::ResourceContext* resource_context_;
   NotificationRegistrar registrar_;
-  bool clear_local_state_on_exit_;
   FilePath cache_path_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeAppCacheService);
 };
 
 #endif  // CONTENT_BROWSER_APPCACHE_CHROME_APPCACHE_SERVICE_H_