Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/mozilla/resources/open-database-null-name.js

 // original test:
 // http://mxr.mozilla.org/mozilla2.0/source/dom/indexedDB/test/test_open_empty_db.html?force=1
 // license of original test:
 // " Any copyright is dedicated to the Public Domain.
 //   http://creativecommons.org/publicdomain/zero/1.0/ "
 
 if (this.importScripts) {
     importScripts('../../../../resources/js-test.js');
     importScripts('../../resources/shared.js');
 }
 
 description("Test IndexedDB: should NOT throw when opening a database with a null name");
 
 function test()
 {
-    removeVendorPrefixes();
-
     request = evalAndLog("indexedDB.open(null);");
     request.onsuccess = openSuccess;
     request.onerror = unexpectedErrorCallback;
 }
 
 function openSuccess()
 {
     db = evalAndLog("db = event.target.result");
     shouldBe("db.name", "'null'");
     finishJSTest();
 }
 
-test();
+test();