Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/resources/intversion-close-in-upgradeneeded.js

 if (this.importScripts) {
     importScripts('../../../resources/js-test.js');
     importScripts('shared.js');
 }
 
 description("Test that when db.close is called in upgradeneeded, the db is cleaned up on refresh.");
 
 function test()
 {
-    removeVendorPrefixes();
     setDBNameFromPath();
 
     request = evalAndLog("indexedDB.deleteDatabase(dbname)");
     request.onsuccess = deleteSuccess;
     request.onerror = unexpectedErrorCallback;
 }
 
 function deleteSuccess(evt) {
     evalAndLog("request = indexedDB.open(dbname, 7)");
     request.onsuccess = unexpectedSuccessCallback;
@@ skipping 32 matching lines @@
     debug("");
     debug("Verify that the old connection is unchanged and was closed:");
     shouldBeNonNull("db");
     shouldBe('db.version', "7");
     evalAndExpectException("db.transaction('os')", "DOMException.INVALID_STATE_ERR", "'InvalidStateError'");
 
     finishJSTest();
 }
 
 test();