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 55 matching lines @@
   }
 
   // Determines if a request for 'url' can be satisfied while offline.
   // This method always completes asynchronously.
   void CanHandleMainResourceOffline(const GURL& url,
                                     net::CompletionCallback* callback);
 
   // Populates 'collection' with info about all of the appcaches stored
   // within the service, 'callback' is invoked upon completion. The service
   // acquires a reference to the 'collection' until until completion.
-  // This method always completes asynchronously.
-  void GetAllAppCacheInfo(AppCacheInfoCollection* collection,
-                          net::CompletionCallback* callback);
+  // This method always completes asynchronously. (virtual for unittesting)
+  virtual void GetAllAppCacheInfo(AppCacheInfoCollection* collection,
+                                  net::CompletionCallback* callback);
 
   // Deletes the group identified by 'manifest_url', 'callback' is
   // invoked upon completion. Upon completion, the cache group and
   // any resources within the group are no longer loadable and all
   // subresource loads for pages associated with a deleted group
   // will fail. This method always completes asynchronously.
   void DeleteAppCacheGroup(const GURL& manifest_url,
                            net::CompletionCallback* callback);
 
   // Deletes all appcaches for the origin, 'callback' is invoked upon
@@ skipping 65 matching lines @@
   BackendMap backends_;  // One 'backend' per child process.
   // Context for use during cache updates.
   net::URLRequestContext* request_context_;
 
   DISALLOW_COPY_AND_ASSIGN(AppCacheService);
 };
 
 }  // namespace appcache
 
 #endif  // WEBKIT_APPCACHE_APPCACHE_SERVICE_H_