Allow default desktop content settings to be managed via policy

chrome/browser/ui/views/options/content_filter_page_view.cc

Index: chrome/browser/ui/views/options/content_filter_page_view.cc
diff --git a/chrome/browser/ui/views/options/content_filter_page_view.cc b/chrome/browser/ui/views/options/content_filter_page_view.cc
index 320611d68e3269d4ca8ae6071bad2ff1370b884f..ecede9e656dd312679ae792a68950a59c876f901 100644
--- a/chrome/browser/ui/views/options/content_filter_page_view.cc
+++ b/chrome/browser/ui/views/options/content_filter_page_view.cc
@@ -152,6 +152,8 @@ void ContentFilterPageView::InitControlLayout() {
 
   registrar_.Add(this, NotificationType::CONTENT_SETTINGS_CHANGED,
       NotificationService::AllSources());
+  registrar_.Add(this, NotificationType::DESKTOP_NOTIFICATION_DEFAULT_CHANGED,
+      NotificationService::AllSources());
 }
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -165,6 +167,8 @@ void ContentFilterPageView::UpdateView() {
   } else if (content_type_ == CONTENT_SETTINGS_TYPE_NOTIFICATIONS) {
     default_setting = profile()->GetDesktopNotificationService()->
         GetDefaultContentSetting();
+    is_content_type_managed = profile()->GetDesktopNotificationService()->
+        IsDefaultContentSettingManaged();
   } else {
     default_setting = profile()->GetHostContentSettingsMap()->
         GetDefaultContentSetting(content_type_);
@@ -267,6 +271,12 @@ void ContentFilterPageView::Observe(NotificationType type,
     NotifyContentSettingsChanged(
         Details<HostContentSettingsMap::ContentSettingsDetails>
             (details).ptr());
+  } else if (type == NotificationType::DESKTOP_NOTIFICATION_DEFAULT_CHANGED) {
+    HostContentSettingsMap::ContentSettingsDetails content_settings_details(
+        HostContentSettingsMap::Pattern(),
+        CONTENT_SETTINGS_TYPE_NOTIFICATIONS,
+        "");
+    NotifyContentSettingsChanged(&content_settings_details);
   } else {
     OptionsPageBase::Observe(type, source, details);
   }