[MD settings] include source of policy for content settings

chrome/browser/ui/webui/settings/site_settings_handler.cc

Index: chrome/browser/ui/webui/settings/site_settings_handler.cc
diff --git a/chrome/browser/ui/webui/settings/site_settings_handler.cc b/chrome/browser/ui/webui/settings/site_settings_handler.cc
index efbd7880d931776f34715946a565ab1b6f3e7b48..9e476111dbc1e21d2a8b3b974dbab4e25743e927 100644
--- a/chrome/browser/ui/webui/settings/site_settings_handler.cc
+++ b/chrome/browser/ui/webui/settings/site_settings_handler.cc
@@ -398,9 +398,9 @@ void SiteSettingsHandler::HandleGetDefaultValueForContentType(
   HostContentSettingsMap* map =
       HostContentSettingsMapFactory::GetForProfile(profile_);
 
-  std::string setting = content_settings::ContentSettingToString(
-      map->GetDefaultContentSetting(content_type, nullptr));
-  ResolveJavascriptCallback(*callback_id, base::StringValue(setting));
+  base::DictionaryValue category;
+  site_settings::GetContentCategorySetting(map, content_type, &category);
+  ResolveJavascriptCallback(*callback_id, category);
 }
 
 void SiteSettingsHandler::HandleGetExceptionList(const base::ListValue* args) {