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diff --git a/chrome/browser/extensions/extension_prefs.h b/chrome/browser/extensions/extension_prefs.h
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+// Copyright (c) 2009 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 CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H
+
+#include <set>
+#include <string>
+#include <vector>
+
+#include "base/task.h"
+#include "chrome/common/extensions/extension.h"
+#include "chrome/common/pref_service.h"
+#include "googleurl/src/gurl.h"
+
+// Class for managing global and per-extension preferences.
+// This class is instantiated by ExtensionsService, so it should be accessed
+// from there.
+class ExtensionPrefs {
+ public:
+  explicit ExtensionPrefs(PrefService* prefs);
+
+  // Returns a copy of the Extensions prefs.
+  // TODO(erikkay) Remove this so that external consumers don't need to be
+  // aware of the internal structure of the preferences.
+  DictionaryValue* CopyCurrentExtensions();
+
+  // Populate |killed_ids| with extension ids that have been killed.
+  void GetKilledExtensionIds(std::set<std::string>* killed_ids);
+
+  // Get the order that toolstrip URLs appear in the shelf.
+  typedef std::vector<GURL> URLList;
+  URLList GetShelfToolstripOrder();
+
+  // Called when an extension is installed, so that prefs get created.
+  void OnExtensionInstalled(Extension* extension);
+
+  // Called when an extension is uninstalled, so that prefs get cleaned up.
+  void OnExtensionUninstalled(const Extension* extension);
+
+ private:
+  // Sets the pref |key| for extension |id| to |value|.
+  bool UpdateExtensionPref(const std::string& id,
+                           const std::wstring& key,
+                           Value* value);
+
+  // Deletes the pref dictionary for extension |id|.
+  void DeleteExtensionPrefs(const std::string& id);
+
+  // Ensures and returns a mutable dictionary for extension |id|'s prefs.
+  DictionaryValue* GetOrCreateExtensionPref(const std::string& id);
+
+  // The pref service specific to this set of extension prefs.
+  PrefService* prefs_;
+
+  // The URLs of all of the toolstrips.
+  URLList shelf_order_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionPrefs);
+};
+
+// A helper class that has a list of the currently installed extensions
+// and can iterate over them to a provided callback.
+class InstalledExtensions {
+ public:
+  explicit InstalledExtensions(ExtensionPrefs* prefs);
+  ~InstalledExtensions();
+
+  typedef Callback3<const std::string&,
+                    const FilePath&,
+                    Extension::Location>::Type Callback;
+
+  // Runs |callback| for each installed extension with the path to the
+  // version directory and the location.
+  void VisitInstalledExtensions(Callback *callback);
+
+ private:
+  // A copy of the extensions pref dictionary so that this can be passed
+  // around without a dependency on prefs.
+  scoped_ptr<DictionaryValue> extension_data_;
+
+  DISALLOW_COPY_AND_ASSIGN(InstalledExtensions);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H