[HBD] Update MD SiteSettingsHandler to support 3 modes.

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 03595e1453cfa7e860e7f10d05e321d9194113f7..2697030d844498f9d19ca90a2ed85c7434b03c1a 100644
--- a/chrome/browser/ui/webui/settings/site_settings_handler.cc
+++ b/chrome/browser/ui/webui/settings/site_settings_handler.cc
@@ -332,16 +332,10 @@ void SiteSettingsHandler::HandleGetDefaultValueForContentType(
           site_settings::ContentSettingsTypeFromGroupName(type)));
   HostContentSettingsMap* map =
       HostContentSettingsMapFactory::GetForProfile(profile_);
-  ContentSetting setting = map->GetDefaultContentSetting(content_type, nullptr);
 
-  // FullScreen is Allow vs. Ask.
-  bool enabled;
-  if (content_type == CONTENT_SETTINGS_TYPE_FULLSCREEN)
-      enabled = setting != CONTENT_SETTING_ASK;
-  else
-      enabled = setting != CONTENT_SETTING_BLOCK;
-
-  ResolveJavascriptCallback(*callback_id, base::FundamentalValue(enabled));
+  std::string setting = content_settings::ContentSettingToString(
+      map->GetDefaultContentSetting(content_type, nullptr));
+  ResolveJavascriptCallback(*callback_id, base::StringValue(setting));
 }
 
 void SiteSettingsHandler::HandleGetExceptionList(const base::ListValue* args) {