Purge in-memory localStorage areas if the # of areas exceeds the limit

webkit/dom_storage/dom_storage_namespace.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 WEBKIT_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
 #define WEBKIT_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 63 matching lines @@
     AreaHolder(DomStorageArea* area, int count);
     ~AreaHolder();
   };
   typedef std::map<GURL, AreaHolder> AreaMap;
 
   ~DomStorageNamespace();
 
   // Returns a pointer to the area holder in our map or NULL.
   AreaHolder* GetAreaHolder(const GURL& origin);
 
+  friend class DomStorageContext;
+  const AreaMap& GetAreaMap() const { return areas_; }
+
   int64 namespace_id_;
   std::string persistent_namespace_id_;
   base::FilePath directory_;
   AreaMap areas_;
   scoped_refptr<DomStorageTaskRunner> task_runner_;
   scoped_refptr<SessionStorageDatabase> session_storage_database_;
 };
 
 }  // namespace dom_storage
 
 
 #endif  // WEBKIT_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_