Indexed DB: Remove vendor prefix removal from tests

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

 if (this.importScripts) {
     importScripts('../../../resources/js-test.js');
     importScripts('shared.js');
 }
 
 description("Call db.close() in the complete handler for a version change transaction, before the success event associated with the open call fires");
 
 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.onupgradeneeded = upgradeNeeded;
@@ skipping 26 matching lines @@
     preamble(evt);
     shouldBeTrue("sawTransactionComplete");
     shouldBeUndefined("event.target.result");
     shouldBeNonNull("event.target.error");
     shouldBeEqualToString("event.target.error.name", "AbortError");
     evalAndExpectException("transaction = db.transaction('os', 'readwrite')", "DOMException.INVALID_STATE_ERR", "'InvalidStateError'");
     finishJSTest();
 }
 
 test();