Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/cursor-properties-expected.txt

 Test that IndexedDB's cursor key/primaryKey/value properties preserve mutations.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-indexedDB = self.indexedDB || self.webkitIndexedDB || self.mozIndexedDB || self.msIndexedDB || self.OIndexedDB;
-
 dbname = "cursor-properties.html"
 indexedDB.deleteDatabase(dbname)
 indexedDB.open(dbname, 1)
 
 onUpgradeNeeded():
 db = event.target.result
 store = db.createObjectStore('store')
 index = store.createIndex('index', 'id')
 store.put({id: ['indexKey']}, ['primaryKey'])
 
@@ skipping 37 matching lines @@
 Check read-only:
 cursor.value = null
 PASS v === cursor.value is true
 Check mutability:
 cursor.value.expando = 123
 PASS cursor.value.expando is 123
 PASS successfullyParsed is true
 
 TEST COMPLETE