Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/resources/delete-in-upgradeneeded-close-in-versionchange.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 connection's 'versionchange' event handler.");
 
 function test()
 {
-    removeVendorPrefixes();
     setDBNameFromPath();
 
     request = evalAndLog("indexedDB.deleteDatabase(dbname)");
     request.onsuccess = initiallyDeleted;
     request.onerror = unexpectedErrorCallback;
 }
 
 var sawUpgradeNeeded = false;
 var sawVersionChange = false;
 
@@ skipping 32 matching lines @@
 
 function deleteSuccessCallback(evt)
 {
     preamble(evt);
     shouldBeTrue("sawVersionChange");
     shouldBeTrue("sawUpgradeNeeded");
     finishJSTest();
 }
 
 test();