Explicitly ShutdownOnUIThread the HostContentSettingsMap when destroying the Profile.

chrome/browser/content_settings/content_settings_notification_provider.cc

 // Copyright (c) 2011 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/content_settings/content_settings_notification_provider.h"
 
 #include "base/string_util.h"
 #include "chrome/browser/notifications/desktop_notification_service_factory.h"
 #include "chrome/browser/notifications/notification.h"
@@ skipping 138 matching lines @@
         CONTENT_SETTING_BLOCK));
   }
 }
 
 void NotificationProvider::ClearAllContentSettingsRules(
       ContentSettingsType content_type) {
   if (content_type == CONTENT_SETTINGS_TYPE_NOTIFICATIONS)
     ResetAllOrigins();
 }
 
+void NotificationProvider::ShutdownOnUIThread() {
+}
+
 void NotificationProvider::Observe(NotificationType type,
                                    const NotificationSource& source,
                                    const NotificationDetails& details) {
   if (NotificationType::PREF_CHANGED == type) {
     const std::string& name = *Details<std::string>(details).ptr();
     OnPrefsChanged(name);
   } else if (NotificationType::PROFILE_DESTROYED == type) {
     StopObserving();
   }
 }
@@ skipping 189 matching lines @@
   prefs->ScheduleSavePersistentPrefs();
 }
 
 void NotificationProvider::ResetAllOrigins() {
   PrefService* prefs = profile_->GetPrefs();
   prefs->ClearPref(prefs::kDesktopNotificationAllowedOrigins);
   prefs->ClearPref(prefs::kDesktopNotificationDeniedOrigins);
 }
 
 }  // namespace content_settings