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diff --git a/content/browser/in_process_webkit/dom_storage_namespace.h b/content/browser/in_process_webkit/dom_storage_namespace.h
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+++ b/content/browser/in_process_webkit/dom_storage_namespace.h
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+// Copyright (c) 2010 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_IN_PROCESS_WEBKIT_DOM_STORAGE_NAMESPACE_H_
+#define CONTENT_BROWSER_IN_PROCESS_WEBKIT_DOM_STORAGE_NAMESPACE_H_
+#pragma once
+
+#include "base/hash_tables.h"
+#include "base/scoped_ptr.h"
+#include "base/string16.h"
+#include "chrome/common/dom_storage_common.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebString.h"
+
+class DOMStorageArea;
+class DOMStorageContext;
+class FilePath;
+class HostContentSettingsMap;
+
+namespace WebKit {
+class WebStorageArea;
+class WebStorageNamespace;
+}
+
+// Only to be used on the WebKit thread.
+class DOMStorageNamespace {
+ public:
+  static DOMStorageNamespace* CreateLocalStorageNamespace(
+      DOMStorageContext* dom_storage_context, const FilePath& data_dir_path);
+  static DOMStorageNamespace* CreateSessionStorageNamespace(
+      DOMStorageContext* dom_storage_context, int64 namespace_id);
+
+  ~DOMStorageNamespace();
+
+  DOMStorageArea* GetStorageArea(const string16& origin,
+                                 HostContentSettingsMap* map);
+  DOMStorageNamespace* Copy(int64 clone_namespace_id);
+
+  void PurgeMemory();
+
+  const DOMStorageContext* dom_storage_context() const {
+    return dom_storage_context_;
+  }
+  int64 id() const { return id_; }
+  const WebKit::WebString& data_dir_path() const { return data_dir_path_; }
+  DOMStorageType dom_storage_type() const { return dom_storage_type_; }
+
+  // Creates a WebStorageArea for the given origin.  This should only be called
+  // by an owned DOMStorageArea.
+  WebKit::WebStorageArea* CreateWebStorageArea(const string16& origin);
+
+ private:
+  // Called by the static factory methods above.
+  DOMStorageNamespace(DOMStorageContext* dom_storage_context,
+                      int64 id,
+                      const WebKit::WebString& data_dir_path,
+                      DOMStorageType storage_type);
+
+  // Creates the underlying WebStorageNamespace on demand.
+  void CreateWebStorageNamespaceIfNecessary();
+
+  // All the storage areas we own.
+  typedef base::hash_map<string16, DOMStorageArea*> OriginToStorageAreaMap;
+  OriginToStorageAreaMap origin_to_storage_area_;
+
+  // The DOMStorageContext that owns us.
+  DOMStorageContext* dom_storage_context_;
+
+  // The WebKit storage namespace we manage.
+  scoped_ptr<WebKit::WebStorageNamespace> storage_namespace_;
+
+  // Our id.  Unique to our parent WebKitContext class.
+  int64 id_;
+
+  // The path used to create us, so we can recreate our WebStorageNamespace on
+  // demand.
+  WebKit::WebString data_dir_path_;
+
+  // SessionStorage vs. LocalStorage.
+  const DOMStorageType dom_storage_type_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(DOMStorageNamespace);
+};
+
+#endif  // CONTENT_BROWSER_IN_PROCESS_WEBKIT_DOM_STORAGE_NAMESPACE_H_