ProtectorService supports multiple change instances.

chrome/browser/protector/default_search_provider_change.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 <algorithm>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 317 matching lines @@
   }
 }
 
 void DefaultSearchProviderChange::OnTemplateURLServiceChanged() {
   TemplateURLService* url_service = GetTemplateURLService();
   if (url_service->GetDefaultSearchProvider() != default_search_provider_) {
     VLOG(1) << "Default search provider has been changed by user";
     default_search_provider_ = NULL;
     url_service->RemoveObserver(this);
     // Will delete this DefaultSearchProviderChange instance.
-    ProtectorServiceFactory::GetForProfile(profile())->DismissChange();
+    ProtectorServiceFactory::GetForProfile(profile())->DismissChange(this);
   }
 }
 
 void DefaultSearchProviderChange::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   DCHECK(type == chrome::NOTIFICATION_TEMPLATE_URL_REMOVED);
   TemplateURLID id = *content::Details<TemplateURLID>(details).ptr();
   if (id == new_id_)
@@ skipping 49 matching lines @@
   return url_service;
 }
 
 BaseSettingChange* CreateDefaultSearchProviderChange(
     const TemplateURL* actual,
     TemplateURL* backup) {
   return new DefaultSearchProviderChange(actual, backup);
 }
 
 }  // namespace protector