Allow to clear session and local storage when not backed on disk

content/browser/dom_storage/dom_storage_namespace.h

 // Copyright 2013 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_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
 #define CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 67 matching lines @@
   void DeleteSessionStorageOrigin(const GURL& origin);
   void PurgeMemory(PurgeOption purge);
   void Shutdown();
   void Flush();
 
   unsigned int CountInMemoryAreas() const;
 
   // Adds memory statistics to |pmd| for chrome://tracing.
   void OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd);
 
+  void GetOriginsWithAreas(std::vector<GURL>* origins) const;
+
  private:
   friend class base::RefCountedThreadSafe<DOMStorageNamespace>;
 
   // Struct to hold references to our contained areas and
   // to keep track of how many tabs have a given area open.
   struct AreaHolder {
     scoped_refptr<DOMStorageArea> area_;
     int open_count_;
     AreaHolder();
     AreaHolder(DOMStorageArea* area, int count);
@@ skipping 12 matching lines @@
   base::FilePath directory_;
   AreaMap areas_;
   scoped_refptr<DOMStorageTaskRunner> task_runner_;
   scoped_refptr<SessionStorageDatabase> session_storage_database_;
 };
 
 }  // namespace content
 
 
 #endif  // CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_