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

content/renderer/dom_storage/webstoragearea_impl.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 CONTENT_RENDERER_DOM_STORAGE_WEBSTORAGEAREA_IMPL_H_
 #define CONTENT_RENDERER_DOM_STORAGE_WEBSTORAGEAREA_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebStorageArea.h"
@@ skipping 19 matching lines @@
   virtual WebKit::WebString key(unsigned index);
   virtual WebKit::WebString getItem(const WebKit::WebString& key);
   virtual void setItem(
       const WebKit::WebString& key, const WebKit::WebString& value,
       const WebKit::WebURL& page_url, WebStorageArea::Result& result);
   virtual void removeItem(
       const WebKit::WebString& key, const WebKit::WebURL& page_url);
   virtual void clear(const WebKit::WebURL& url);
   virtual size_t memoryBytesUsedByCache() const;
 
+  dom_storage::DomStorageCachedArea* cached_area() {
+    return cached_area_.get();
+  }
+
  private:
   int connection_id_;
   scoped_refptr<dom_storage::DomStorageCachedArea> cached_area_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_DOM_STORAGE_WEBSTORAGEAREA_IMPL_H_