Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/resources/delete-in-upgradeneeded-close-in-open-success.js

 if (this.importScripts) {
     importScripts('../../../resources/js-test.js');
     importScripts('shared.js');
 }
 
 description("Test that a deleteDatabase called while handling an upgradeneeded event is queued and fires its events at the right time. The close() call to unblock the delete occurs in the open request's 'success' event handler.");
 
 function test()
 {
-    removeVendorPrefixes();
     setDBNameFromPath();
 
     request = evalAndLog("indexedDB.deleteDatabase(dbname)");
     request.onsuccess = initiallyDeleted;
     request.onerror = unexpectedErrorCallback;
 }
 
 var sawUpgradeNeeded = false;
 var sawOpenSuccess = false;
 var sawVersionChange = false;
@@ skipping 59 matching lines @@
 
 function deleteSuccessCallback(evt)
 {
     preamble(evt);
     shouldBeTrue("sawVersionChange");
     shouldBeTrue("sawDeleteBlocked");
     finishJSTest();
 }
 
 test();