remove Symbol polyfill

www/common/boot2.js

@@ -26,14 +26,6 @@ define([
         Number.MAX_SAFE_INTEGER = 9007199254740991;
     }
 
-    if (typeof(window.Symbol) !== 'function') {
-        var idCounter = 0;
-        var Symbol = window.Symbol = function Symbol(key) {
-            return '__' + key + '_' + Math.floor(Math.random() * 1e9) + '_' + (++idCounter) + '__';
-        };
-        Symbol.iterator = Symbol('Symbol.iterator');
-    }
-
     var failStore = function () {
         console.error(new Error('wut'));
         require(['jquery'], function ($) {

www/common/sframe-boot2.js

@@ -18,14 +18,6 @@ define([
         Number.MAX_SAFE_INTEGER = 9007199254740991;
     }
 
-    if (typeof(window.Symbol) !== 'function') {
-        var idCounter = 0;
-        var Symbol = window.Symbol = function Symbol(key) {
-            return '__' + key + '_' + Math.floor(Math.random() * 1e9) + '_' + (++idCounter) + '__';
-        };
-        Symbol.iterator = Symbol('Symbol.iterator');
-    }
-
     var mkFakeStore = function () {
         var fakeStorage = {
             getItem: function (k) { return fakeStorage[k]; },