Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/dont-wedge-expected.txt

 Check that a page reloaded during an in-flight upgradeneeded event doesn't hang.
 
 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 = "dont-wedge.html"
 dbname1 = dbname + '1'
 dbname2 = dbname + '2'
 
 deleteDatabase1():
 indexedDB.deleteDatabase(dbname1)
 In a multi process implementation this deleteDatabase may be blocked temporarily, so we don't check for either the presence or absence of a blocked event.
 
 deleteDatabase2():
 indexedDB.deleteDatabase(dbname2)
 
 openDatabase1():
 indexedDB.open(dbname1, 1)
 
 openOnUpgradeNeeded1():
 db1 = event.target.result
 store1 = db1.createObjectStore('store')
 store1.put(0, 0)
 
 openOnSuccess1():
 PASS isAfterReload() is true
 PASS successfullyParsed is true
 
 TEST COMPLETE