Revert "Add indexeddb polyfil"

This reverts commit e101840.

Author: dplewis

integration/test/helper.js

@@ -5,7 +5,6 @@ const CustomAuth = require('./CustomAuth');
 const sleep = require('./sleep');
 const { TestUtils } = require('parse-server');
 const Parse = require('../../node');
-const setGlobalVars = require('indexeddbshim');
 
 const port = 1337;
 const mountPath = '/parse';
@@ -115,8 +114,6 @@ global.Container = Parse.Object.extend('Container');
 global.TestPoint = Parse.Object.extend('TestPoint');
 global.TestObject = Parse.Object.extend('TestObject');
 global.reconfigureServer = reconfigureServer;
-global.window = global; // Used for indexedDB shim
-setGlobalVars();
 
 beforeAll(async () => {
   await reconfigureServer();