Remove unused JavaScript variables.

Summary: There are a bunch of unused variables in JavaScript files. These were identified with JSHint.

Test Plan: It's pretty hard to test this thoroughly... on inspection, it seems that everything //should// be okay (unless we are doing weird things with the JavaScript).

Reviewers: chad, #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9676

webroot/rsrc/js/application/uiexample/ReactorFocusExample.js

@@ -8,7 +8,7 @@
 JX.install('ReactorFocusExample', {
   extend: 'View',
   members: {
-    render: function(rendered_children) {
+    render: function() {
       var input = JX.$N('input');
       return [input, JX.RDOM.$DT(JX.RDOM.hasFocus(input))];
     }