Add controlled setting indicator for default search engine configuration

chrome/browser/resources/options/browser_options.js

Index: chrome/browser/resources/options/browser_options.js
diff --git a/chrome/browser/resources/options/browser_options.js b/chrome/browser/resources/options/browser_options.js
index 2cad57c18e0e449711bd756ad22f5ad0317caa2b..8314ee3371f8c3b2856e959f5d43f8d505fcecb7 100644
--- a/chrome/browser/resources/options/browser_options.js
+++ b/chrome/browser/resources/options/browser_options.js
@@ -819,6 +819,8 @@ cr.define('options', function() {
       this.clearSearchEngines_();
       engineSelect = $('default-search-engine');
       engineSelect.disabled = defaultManaged;
+      if (defaultManaged && defaultValue == -1)
+        return;
       engineCount = engines.length;
       var defaultIndex = -1;
       for (var i = 0; i < engineCount; i++) {