Fix memory leak caused by Rules Registries

chrome/browser/extensions/api/declarative/rules_registry_service.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 CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_RULES_REGISTRY_SERVICE_H__
 #define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_RULES_REGISTRY_SERVICE_H__
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 16 matching lines @@
 
 namespace extensions {
 
 // This class owns all RulesRegistries implementations of an ExtensionService.
 // This class lives on the UI thread.
 class RulesRegistryService : public content::NotificationObserver  {
  public:
   explicit RulesRegistryService(Profile* profile);
   virtual ~RulesRegistryService();
 
+  // Unregisters refptrs to concrete RulesRegistries at other objects that were
+  // created by us so that the RulesRegistries can be released.
+  void Shutdown();
+
   // Registers the default RulesRegistries used in Chromium.
   void RegisterDefaultRulesRegistries();
 
   // Registers a RulesRegistry and wraps it in an InitializingRulesRegistry.
   void RegisterRulesRegistry(const std::string& event_name,
                              scoped_refptr<RulesRegistry> rule_registry);
 
   // Returns the RulesRegistry for |event_name| or NULL if no such registry
   // has been registered.
   scoped_refptr<RulesRegistry> GetRulesRegistry(
@@ skipping 18 matching lines @@
   RulesRegistryMap rule_registries_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(RulesRegistryService);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_RULES_REGISTRY_SERVICE_H__