AppCaches which belong to hosted apps are not protected from deletion

webkit/appcache/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 WEBKIT_APPCACHE_APPCACHE_SERVICE_H_
 #define WEBKIT_APPCACHE_APPCACHE_SERVICE_H_
 
 #include <map>
 #include <set>
 
@@ skipping 114 matching lines @@
   // See chrome/browser/AppCacheDispatcherHost.
   void RegisterBackend(AppCacheBackendImpl* backend_impl);
   void UnregisterBackend(AppCacheBackendImpl* backend_impl);
   AppCacheBackendImpl* GetBackend(int id) const {
     BackendMap::const_iterator it = backends_.find(id);
     return (it != backends_.end()) ? it->second : NULL;
   }
 
   AppCacheStorage* storage() const { return storage_.get(); }
 
+  bool clear_local_state_on_exit() const { return clear_local_state_on_exit_; }
+  void set_clear_local_state_on_exit(bool clear_local_state_on_exit) {
+    clear_local_state_on_exit_ = clear_local_state_on_exit; }
+
  protected:
   friend class AppCacheStorageImplTest;
   friend class AppCacheServiceTest;
 
   class AsyncHelper;
   class CanHandleOfflineHelper;
   class DeleteHelper;
   class DeleteOriginHelper;
   class GetInfoHelper;
 
   typedef std::set<AsyncHelper*> PendingAsyncHelpers;
   typedef std::map<int, AppCacheBackendImpl*> BackendMap;
 
   AppCachePolicy* appcache_policy_;
   AppCacheQuotaClient* quota_client_;
   scoped_ptr<AppCacheStorage> storage_;
   scoped_refptr<quota::SpecialStoragePolicy> special_storage_policy_;
   scoped_refptr<quota::QuotaManagerProxy> quota_manager_proxy_;
   PendingAsyncHelpers pending_helpers_;
   BackendMap backends_;  // One 'backend' per child process.
   // Context for use during cache updates.
   net::URLRequestContext* request_context_;
+  bool clear_local_state_on_exit_;
 
   DISALLOW_COPY_AND_ASSIGN(AppCacheService);
 };
 
 }  // namespace appcache
 
 #endif  // WEBKIT_APPCACHE_APPCACHE_SERVICE_H_