Fix an error where the onchange() only worked due to scoping rules on the

Website Settings page.

Review URL: https://codereview.chromium.org/549083005

Cr-Commit-Position: refs/heads/master@{#293753}

chrome/browser/resources/options/website_settings.js

@@ -39,7 +39,7 @@ cr.define('options', function() {
       $('website-settings-overlay-confirm').onclick =
           PageManager.closeOverlay.bind(PageManager);
 
-      $('resourceType').onchange = function() {
+      $('resourceType').onchange = function(event) {
         var target = event.target;
         assert(target.tagName == 'SELECT');
         if (target.value == 'storage')