Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/intversion-persistence-expected.txt

 Test that integer versions are retained when backing store is opened/closed/re-opened.
 
 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 = "intversion-persistence.html"
 dbname = dbname + Date.now()
 
 openFirstTime():
 indexedDB.open(dbname, 1)
 db = request.result
 upgradeNeededFired = true
 PASS db.version is 1
 PASS db.objectStoreNames.length is 0
 db.createObjectStore('store')
 PASS upgradeNeededFired is true
 db = request.result
 PASS db.version is 1
 PASS db.objectStoreNames.length is 1
 db.close()
 
 openSecondTime():
 indexedDB.open(dbname, 1)
 db = request.result
 PASS db.version is 1
 PASS db.objectStoreNames.length is 1
 db.close()
 
 PASS successfullyParsed is true
 
 TEST COMPLETE