Fix memory leak caused by Rules Registries

chrome/browser/extensions/api/declarative/rules_registry_service.cc

 // 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.
 
 #include "chrome/browser/extensions/api/declarative/rules_registry_service.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "content/public/browser/browser_thread.h"
 #include "chrome/browser/extensions/api/declarative/initializing_rules_registry.h"
@@ skipping 31 matching lines @@
   scoped_refptr<WebRequestRulesRegistry> web_request_rules_registry(
       new WebRequestRulesRegistry);
   RegisterRulesRegistry(declarative_webrequest_constants::kOnRequest,
                         web_request_rules_registry);
   content::BrowserThread::PostTask(
       content::BrowserThread::IO, FROM_HERE,
       base::Bind(&RegisterToExtensionWebRequestEventRouterOnIO,
           web_request_rules_registry));
 }
 
+void RulesRegistryService::Shutdown() {
+  content::BrowserThread::PostTask(
+      content::BrowserThread::IO, FROM_HERE,
+      base::Bind(&RegisterToExtensionWebRequestEventRouterOnIO,
+          scoped_refptr<WebRequestRulesRegistry>(NULL)));
+}
+
 void RulesRegistryService::RegisterRulesRegistry(
     const std::string& event_name,
     scoped_refptr<RulesRegistry> rule_registry) {
   DCHECK(rule_registries_.find(event_name) == rule_registries_.end());
   rule_registries_[event_name] =
       make_scoped_refptr(new InitializingRulesRegistry(rule_registry));
 }
 
 scoped_refptr<RulesRegistry> RulesRegistryService::GetRulesRegistry(
     const std::string& event_name) const {
@@ skipping 35 matching lines @@
       OnExtensionUnloaded(extension->id());
       break;
     }
     default:
       NOTREACHED();
       break;
   }
 }
 
 }  // namespace extensions