Fix runtime JavaScript errors in chrome://options

chrome/browser/resources/options/chromeos_system_options.js

Index: chrome/browser/resources/options/chromeos_system_options.js
diff --git a/chrome/browser/resources/options/chromeos_system_options.js b/chrome/browser/resources/options/chromeos_system_options.js
index 6f1cb31548f05e2f3147d5b30a1fb6927d2a5687..48af6ae4163bfa1f62e84b15b2b2e58a74534e1f 100644
--- a/chrome/browser/resources/options/chromeos_system_options.js
+++ b/chrome/browser/resources/options/chromeos_system_options.js
@@ -38,11 +38,5 @@ SystemOptions.prototype = {
     $('language-button').onclick = function(event) {
       // TODO: Open ChromeOS language settings page.
     };
-    $('sync-button').onclick = function(event) {
-      OptionsPage.showPageByName('sync');
-    }
-    $('dummy-button').onclick = function(event) {
-      OptionsPage.showOverlay('dummy');
-    }
   },
 };